57018991 has 2 divisors, whose sum is σ = 57018992. Its totient is φ = 57018990.

The previous prime is 57018979. The next prime is 57019073. The reversal of 57018991 is 19981075.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 57018991 - 2¹¹ = 57016943 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57018931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28509495 + 28509496.

It is an arithmetic number, because the mean of its divisors is an integer number (28509496).

Almost surely, 2^57018991 is an apocalyptic number.

57018991 is a deficient number, since it is larger than the sum of its proper divisors (1).

57018991 is an equidigital number, since it uses as much as digits as its factorization.

57018991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 40.

The square root of 57018991 is about 7551.0920402284. The cubic root of 57018991 is about 384.8928492502.

The spelling of 57018991 in words is "fifty-seven million, eighteen thousand, nine hundred ninety-one".