57129439 has 2 divisors, whose sum is σ = 57129440. Its totient is φ = 57129438.

The previous prime is 57129427. The next prime is 57129451. The reversal of 57129439 is 93492175.

It is a balanced prime because it is at equal distance from previous prime (57129427) and next prime (57129451).

It is a cyclic number.

It is not a de Polignac number, because 57129439 - 2²¹ = 55032287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57129419) 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, 28564719 + 28564720.

It is an arithmetic number, because the mean of its divisors is an integer number (28564720).

Almost surely, 2^57129439 is an apocalyptic number.

57129439 is a deficient number, since it is larger than the sum of its proper divisors (1).

57129439 is an equidigital number, since it uses as much as digits as its factorization.

57129439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 40.

The square root of 57129439 is about 7558.4018813503. The cubic root of 57129439 is about 385.1412064257.

It can be divided in two parts, 5712 and 9439, that added together give a palindrome (15151).

The spelling of 57129439 in words is "fifty-seven million, one hundred twenty-nine thousand, four hundred thirty-nine".