57266981 has 2 divisors, whose sum is σ = 57266982. Its totient is φ = 57266980.

The previous prime is 57266947. The next prime is 57267011. The reversal of 57266981 is 18966275.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33744481 + 23522500 = 5809^2 + 4850^2 .

It is a cyclic number.

It is not a de Polignac number, because 57266981 - 2¹⁴ = 57250597 is a prime.

It is a super-2 number, since 2×57266981² = 6559014225708722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57266581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28633490 + 28633491.

It is an arithmetic number, because the mean of its divisors is an integer number (28633491).

Almost surely, 2^57266981 is an apocalyptic number.

It is an amenable number.

57266981 is a deficient number, since it is larger than the sum of its proper divisors (1).

57266981 is an equidigital number, since it uses as much as digits as its factorization.

57266981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 44.

The square root of 57266981 is about 7567.4950280790. The cubic root of 57266981 is about 385.4500409934.

The spelling of 57266981 in words is "fifty-seven million, two hundred sixty-six thousand, nine hundred eighty-one".