651799481 has 4 divisors (see below), whose sum is σ = 657567732. Its totient is φ = 646031232.

The previous prime is 651799469. The next prime is 651799483. The reversal of 651799481 is 184997156.

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 290191225 + 361608256 = 17035^2 + 19016^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-651799481 is a prime.

It is a super-2 number, since 2×651799481² = 849685126863738722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (651799483) 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, 2883956 + ... + 2884181.

It is an arithmetic number, because the mean of its divisors is an integer number (164391933).

Almost surely, 2^651799481 is an apocalyptic number.

It is an amenable number.

651799481 is a deficient number, since it is larger than the sum of its proper divisors (5768251).

651799481 is a wasteful number, since it uses less digits than its factorization.

651799481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5768250.

The product of its digits is 544320, while the sum is 50.

The square root of 651799481 is about 25530.3639026160. The cubic root of 651799481 is about 867.0377435769.

The spelling of 651799481 in words is "six hundred fifty-one million, seven hundred ninety-nine thousand, four hundred eighty-one".