57238381 has 2 divisors, whose sum is σ = 57238382. Its totient is φ = 57238380.

The previous prime is 57238367. The next prime is 57238387. The reversal of 57238381 is 18383275.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55264356 + 1974025 = 7434^2 + 1405^2 .

It is a cyclic number.

It is not a de Polignac number, because 57238381 - 2⁷ = 57238253 is a prime.

It is a super-2 number, since 2×57238381² = 6552464519002322, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 57238381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57238387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28619190 + 28619191.

It is an arithmetic number, because the mean of its divisors is an integer number (28619191).

Almost surely, 2^57238381 is an apocalyptic number.

It is an amenable number.

57238381 is a deficient number, since it is larger than the sum of its proper divisors (1).

57238381 is an equidigital number, since it uses as much as digits as its factorization.

57238381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 37.

The square root of 57238381 is about 7565.6051311181. The cubic root of 57238381 is about 385.3858637738.

The spelling of 57238381 in words is "fifty-seven million, two hundred thirty-eight thousand, three hundred eighty-one".