57218969 has 2 divisors, whose sum is σ = 57218970. Its totient is φ = 57218968.

The previous prime is 57218951. The next prime is 57218981. The reversal of 57218969 is 96981275.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46063369 + 11155600 = 6787^2 + 3340^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57218969 is a prime.

It is a super-2 number, since 2×57218969² = 6548020826845922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (57211969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28609484 + 28609485.

It is an arithmetic number, because the mean of its divisors is an integer number (28609485).

Almost surely, 2^57218969 is an apocalyptic number.

It is an amenable number.

57218969 is a deficient number, since it is larger than the sum of its proper divisors (1).

57218969 is an equidigital number, since it uses as much as digits as its factorization.

57218969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 47.

The square root of 57218969 is about 7564.3221110685. The cubic root of 57218969 is about 385.3422918666.

The spelling of 57218969 in words is "fifty-seven million, two hundred eighteen thousand, nine hundred sixty-nine".