57213439 has 2 divisors, whose sum is σ = 57213440. Its totient is φ = 57213438.

The previous prime is 57213437. The next prime is 57213451. The reversal of 57213439 is 93431275.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 57213439 - 2¹ = 57213437 is a prime.

Together with 57213437, it forms a pair of twin primes.

It is a zygodrome in base 8.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57213437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28606719 + 28606720.

It is an arithmetic number, because the mean of its divisors is an integer number (28606720).

Almost surely, 2^57213439 is an apocalyptic number.

57213439 is a deficient number, since it is larger than the sum of its proper divisors (1).

57213439 is an equidigital number, since it uses as much as digits as its factorization.

57213439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 34.

The square root of 57213439 is about 7563.9565704729. The cubic root of 57213439 is about 385.3298775015.

The spelling of 57213439 in words is "fifty-seven million, two hundred thirteen thousand, four hundred thirty-nine".