57081439 has 2 divisors, whose sum is σ = 57081440. Its totient is φ = 57081438.

The previous prime is 57081433. The next prime is 57081443. The reversal of 57081439 is 93418075.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57081439 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 57081398 and 57081407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57081433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28540719 + 28540720.

It is an arithmetic number, because the mean of its divisors is an integer number (28540720).

Almost surely, 2^57081439 is an apocalyptic number.

57081439 is a deficient number, since it is larger than the sum of its proper divisors (1).

57081439 is an equidigital number, since it uses as much as digits as its factorization.

57081439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 57081439 is about 7555.2259397056. The cubic root of 57081439 is about 385.0333113360.

The spelling of 57081439 in words is "fifty-seven million, eighty-one thousand, four hundred thirty-nine".