57809491 has 2 divisors, whose sum is σ = 57809492. Its totient is φ = 57809490.

The previous prime is 57809489. The next prime is 57809509. The reversal of 57809491 is 19490875.

57809491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 57809491 - 2¹ = 57809489 is a prime.

Together with 57809489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (57809431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28904745 + 28904746.

It is an arithmetic number, because the mean of its divisors is an integer number (28904746).

Almost surely, 2^57809491 is an apocalyptic number.

57809491 is a deficient number, since it is larger than the sum of its proper divisors (1).

57809491 is an equidigital number, since it uses as much as digits as its factorization.

57809491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 57809491 is about 7603.2552896769. The cubic root of 57809491 is about 386.6633849140.

The spelling of 57809491 in words is "fifty-seven million, eight hundred nine thousand, four hundred ninety-one".