57198391 has 2 divisors, whose sum is σ = 57198392. Its totient is φ = 57198390.

The previous prime is 57198377. The next prime is 57198433. The reversal of 57198391 is 19389175.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 57198391 - 2¹⁹ = 56674103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57198311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28599195 + 28599196.

It is an arithmetic number, because the mean of its divisors is an integer number (28599196).

Almost surely, 2^57198391 is an apocalyptic number.

57198391 is a deficient number, since it is larger than the sum of its proper divisors (1).

57198391 is an equidigital number, since it uses as much as digits as its factorization.

57198391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 43.

The square root of 57198391 is about 7562.9617875539. The cubic root of 57198391 is about 385.2960920102.

The spelling of 57198391 in words is "fifty-seven million, one hundred ninety-eight thousand, three hundred ninety-one".