57771391 has 2 divisors, whose sum is σ = 57771392. Its totient is φ = 57771390.

The previous prime is 57771379. The next prime is 57771401. The reversal of 57771391 is 19317775.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57771391 is a prime.

It is equal to p_3437599 and since 57771391 and 3437599 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57771991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28885695 + 28885696.

It is an arithmetic number, because the mean of its divisors is an integer number (28885696).

Almost surely, 2^57771391 is an apocalyptic number.

57771391 is a deficient number, since it is larger than the sum of its proper divisors (1).

57771391 is an equidigital number, since it uses as much as digits as its factorization.

57771391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46305, while the sum is 40.

The square root of 57771391 is about 7600.7493709502. The cubic root of 57771391 is about 386.5784212843.

The spelling of 57771391 in words is "fifty-seven million, seven hundred seventy-one thousand, three hundred ninety-one".