268831981 has 12 divisors (see below), whose sum is σ = 306583200. Its totient is φ = 233761880.

The previous prime is 268831951. The next prime is 268831987. The reversal of 268831981 is 189138862.

It is not a de Polignac number, because 268831981 - 2²¹ = 266734829 is a prime.

It is a super-2 number, since 2×268831981² = 144541268016768722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (268831987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17281 + ... + 28918.

It is an arithmetic number, because the mean of its divisors is an integer number (25548600).

Almost surely, 2^268831981 is an apocalyptic number.

It is an amenable number.

268831981 is a deficient number, since it is larger than the sum of its proper divisors (37751219).

268831981 is a wasteful number, since it uses less digits than its factorization.

268831981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46256 (or 46233 counting only the distinct ones).

The product of its digits is 165888, while the sum is 46.

The square root of 268831981 is about 16396.0965171592. The cubic root of 268831981 is about 645.3970521674.

The spelling of 268831981 in words is "two hundred sixty-eight million, eight hundred thirty-one thousand, nine hundred eighty-one".