57242981 has 2 divisors, whose sum is σ = 57242982. Its totient is φ = 57242980.

The previous prime is 57242849. The next prime is 57242989. The reversal of 57242981 is 18924275.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50268100 + 6974881 = 7090^2 + 2641^2 .

It is a cyclic number.

It is not a de Polignac number, because 57242981 - 2¹⁰ = 57241957 is a prime.

It is a super-2 number, since 2×57242981² = 6553517747532722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57242989) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28621490 + 28621491.

It is an arithmetic number, because the mean of its divisors is an integer number (28621491).

Almost surely, 2^57242981 is an apocalyptic number.

It is an amenable number.

57242981 is a deficient number, since it is larger than the sum of its proper divisors (1).

57242981 is an equidigital number, since it uses as much as digits as its factorization.

57242981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 38.

The square root of 57242981 is about 7565.9091324176. The cubic root of 57242981 is about 385.3961874264.

The spelling of 57242981 in words is "fifty-seven million, two hundred forty-two thousand, nine hundred eighty-one".