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651461989 = 1374755197
BaseRepresentation
bin100110110101001…
…000010101100101
31200101211200211211
4212311020111211
52313233240424
6144351031421
722100223043
oct4665102545
91611750754
10651461989
11304808042
1216220b571
13a4c76589
1462741393
153c2d5b94
hex26d48565

651461989 has 4 divisors (see below), whose sum is σ = 656217324. Its totient is φ = 646706656.

The previous prime is 651461977. The next prime is 651461999. The reversal of 651461989 is 989164156.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 281669089 + 369792900 = 16783^2 + 19230^2 .

It is a cyclic number.

It is not a de Polignac number, because 651461989 - 229 = 114591077 is a prime.

It is a super-2 number, since 2×6514619892 = 848805446223672242, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651461929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2377462 + ... + 2377735.

It is an arithmetic number, because the mean of its divisors is an integer number (164054331).

Almost surely, 2651461989 is an apocalyptic number.

It is an amenable number.

651461989 is a deficient number, since it is larger than the sum of its proper divisors (4755335).

651461989 is a wasteful number, since it uses less digits than its factorization.

651461989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4755334.

The product of its digits is 466560, while the sum is 49.

The square root of 651461989 is about 25523.7534269551. The cubic root of 651461989 is about 866.8880713593. Note that the first 3 decimals are identical.

The spelling of 651461989 in words is "six hundred fifty-one million, four hundred sixty-one thousand, nine hundred eighty-nine".

Divisors: 1 137 4755197 651461989