57047491 has 2 divisors, whose sum is σ = 57047492. Its totient is φ = 57047490.

The previous prime is 57047483. The next prime is 57047503. The reversal of 57047491 is 19474075.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 57047491 - 2³ = 57047483 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 57047491.

It is not a weakly prime, because it can be changed into another prime (57047411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28523745 + 28523746.

It is an arithmetic number, because the mean of its divisors is an integer number (28523746).

Almost surely, 2^57047491 is an apocalyptic number.

57047491 is a deficient number, since it is larger than the sum of its proper divisors (1).

57047491 is an equidigital number, since it uses as much as digits as its factorization.

57047491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35280, while the sum is 37.

The square root of 57047491 is about 7552.9789487327. The cubic root of 57047491 is about 384.9569660114.

The spelling of 57047491 in words is "fifty-seven million, forty-seven thousand, four hundred ninety-one".