Search a number
-
+
643523137 = 2922190453
BaseRepresentation
bin100110010110110…
…110001001000001
31122211220100210021
4212112312021001
52304220220022
6143504533441
721642566515
oct4626661101
91584810707
10643523137
11300285504
1215b621281
13a3426c2a
1461676145
153b7687c7
hex265b6241

643523137 has 4 divisors (see below), whose sum is σ = 665713620. Its totient is φ = 621332656.

The previous prime is 643523131. The next prime is 643523143. The reversal of 643523137 is 731325346.

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

It is an interprime number because it is at equal distance from previous prime (643523131) and next prime (643523143).

It can be written as a sum of positive squares in 2 ways, for example, as 294431281 + 349091856 = 17159^2 + 18684^2 .

It is not a de Polignac number, because 643523137 - 215 = 643490369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643523131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11095198 + ... + 11095255.

It is an arithmetic number, because the mean of its divisors is an integer number (166428405).

Almost surely, 2643523137 is an apocalyptic number.

It is an amenable number.

643523137 is a deficient number, since it is larger than the sum of its proper divisors (22190483).

643523137 is a wasteful number, since it uses less digits than its factorization.

643523137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22190482.

The product of its digits is 45360, while the sum is 34.

The square root of 643523137 is about 25367.7578236627. The cubic root of 643523137 is about 863.3523099572.

The spelling of 643523137 in words is "six hundred forty-three million, five hundred twenty-three thousand, one hundred thirty-seven".

Divisors: 1 29 22190453 643523137