57218947 has 2 divisors, whose sum is σ = 57218948. Its totient is φ = 57218946.

The previous prime is 57218927. The next prime is 57218951. The reversal of 57218947 is 74981275.

57218947 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 57218947 - 2¹¹ = 57216899 is a prime.

It is not a weakly prime, because it can be changed into another prime (57218927) 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, 28609473 + 28609474.

It is an arithmetic number, because the mean of its divisors is an integer number (28609474).

Almost surely, 2^57218947 is an apocalyptic number.

57218947 is a deficient number, since it is larger than the sum of its proper divisors (1).

57218947 is an equidigital number, since it uses as much as digits as its factorization.

57218947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 141120, while the sum is 43.

The square root of 57218947 is about 7564.3206568733. The cubic root of 57218947 is about 385.3422424802.

The spelling of 57218947 in words is "fifty-seven million, two hundred eighteen thousand, nine hundred forty-seven".