57331381 has 2 divisors, whose sum is σ = 57331382. Its totient is φ = 57331380.

The previous prime is 57331367. The next prime is 57331409. The reversal of 57331381 is 18313375.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57244356 + 87025 = 7566^2 + 295^2 .

It is a cyclic number.

It is not a de Polignac number, because 57331381 - 2⁹ = 57330869 is a prime.

It is a super-2 number, since 2×57331381² = 6573774494734322, 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 (57331301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28665690 + 28665691.

It is an arithmetic number, because the mean of its divisors is an integer number (28665691).

Almost surely, 2^57331381 is an apocalyptic number.

It is an amenable number.

57331381 is a deficient number, since it is larger than the sum of its proper divisors (1).

57331381 is an equidigital number, since it uses as much as digits as its factorization.

57331381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 31.

The square root of 57331381 is about 7571.7488732789. The cubic root of 57331381 is about 385.5944737483.

The spelling of 57331381 in words is "fifty-seven million, three hundred thirty-one thousand, three hundred eighty-one".