268992981 has 56 divisors (see below), whose sum is σ = 429365376. Its totient is φ = 168078240.

The previous prime is 268992973. The next prime is 268993001. The reversal of 268992981 is 189299862.

268992981 is a `hidden beast` number, since 268 + 99 + 298 + 1 = 666.

It is not a de Polignac number, because 268992981 - 2³ = 268992973 is a prime.

It is a super-2 number, since 2×268992981² = 144714447654532722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (268992881) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 1022656 + ... + 1022918.

Almost surely, 2^268992981 is an apocalyptic number.

It is an amenable number.

268992981 is a deficient number, since it is larger than the sum of its proper divisors (160372395).

268992981 is an equidigital number, since it uses as much as digits as its factorization.

268992981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365 (or 350 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 54.

The square root of 268992981 is about 16401.0054874694. The cubic root of 268992981 is about 645.5258664410.

The spelling of 268992981 in words is "two hundred sixty-eight million, nine hundred ninety-two thousand, nine hundred eighty-one".