57321787 has 2 divisors, whose sum is σ = 57321788. Its totient is φ = 57321786.

The previous prime is 57321767. The next prime is 57321791. The reversal of 57321787 is 78712375.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 57321787 - 2⁷ = 57321659 is a prime.

It is not a weakly prime, because it can be changed into another prime (57321757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28660893 + 28660894.

It is an arithmetic number, because the mean of its divisors is an integer number (28660894).

Almost surely, 2^57321787 is an apocalyptic number.

57321787 is a deficient number, since it is larger than the sum of its proper divisors (1).

57321787 is an equidigital number, since it uses as much as digits as its factorization.

57321787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82320, while the sum is 40.

The square root of 57321787 is about 7571.1153075356. The cubic root of 57321787 is about 385.5729637149.

The spelling of 57321787 in words is "fifty-seven million, three hundred twenty-one thousand, seven hundred eighty-seven".