264699981 has 40 divisors (see below), whose sum is σ = 486679424. Its totient is φ = 139618080.

The previous prime is 264699949. The next prime is 264699983. The reversal of 264699981 is 189996462.

It is not a de Polignac number, because 264699981 - 2⁵ = 264699949 is a prime.

It is a super-2 number, since 2×264699981² = 140132159882800722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (264699983) 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 39 ways as a sum of consecutive naturals, for example, 10585 + ... + 25326.

Almost surely, 2^264699981 is an apocalyptic number.

264699981 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

264699981 is a deficient number, since it is larger than the sum of its proper divisors (221979443).

264699981 is a wasteful number, since it uses less digits than its factorization.

264699981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35943 (or 35934 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 54.

The square root of 264699981 is about 16269.6029761024. The cubic root of 264699981 is about 642.0733386391.

The spelling of 264699981 in words is "two hundred sixty-four million, six hundred ninety-nine thousand, nine hundred eighty-one".