268576981 has 4 divisors (see below), whose sum is σ = 271041100. Its totient is φ = 266112864.

The previous prime is 268576949. The next prime is 268577009. The reversal of 268576981 is 189675862.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 189675862 = 2 ⋅94837931.

It can be written as a sum of positive squares in 2 ways, for example, as 199769956 + 68807025 = 14134^2 + 8295^2 .

It is a cyclic number.

It is not a de Polignac number, because 268576981 - 2⁵ = 268576949 is a prime.

It is a super-2 number, since 2×268576981² = 144267189446148722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (268576181) 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, 1231896 + ... + 1232113.

It is an arithmetic number, because the mean of its divisors is an integer number (67760275).

Almost surely, 2^268576981 is an apocalyptic number.

It is an amenable number.

268576981 is a deficient number, since it is larger than the sum of its proper divisors (2464119).

268576981 is a wasteful number, since it uses less digits than its factorization.

268576981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2464118.

The product of its digits is 1451520, while the sum is 52.

The square root of 268576981 is about 16388.3184311265. The cubic root of 268576981 is about 645.1929242814.

The spelling of 268576981 in words is "two hundred sixty-eight million, five hundred seventy-six thousand, nine hundred eighty-one".