57218047 has 2 divisors, whose sum is σ = 57218048. Its totient is φ = 57218046.

The previous prime is 57217999. The next prime is 57218093. The reversal of 57218047 is 74081275.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 57218047 - 2¹⁵ = 57185279 is a prime.

It is a super-3 number, since 3×57218047³ (a number of 24 digits) contains 333 as substring.

It is a zygodrome in base 8.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57218947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28609023 + 28609024.

It is an arithmetic number, because the mean of its divisors is an integer number (28609024).

Almost surely, 2^57218047 is an apocalyptic number.

57218047 is a deficient number, since it is larger than the sum of its proper divisors (1).

57218047 is an equidigital number, since it uses as much as digits as its factorization.

57218047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 57218047 is about 7564.2611668292. The cubic root of 57218047 is about 385.3402221130.

The spelling of 57218047 in words is "fifty-seven million, two hundred eighteen thousand, forty-seven".