57191369 has 2 divisors, whose sum is σ = 57191370. Its totient is φ = 57191368.

The previous prime is 57191357. The next prime is 57191371. The reversal of 57191369 is 96319175.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37945600 + 19245769 = 6160^2 + 4387^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57191369 is a prime.

It is a super-2 number, since 2×57191369² = 6541705376188322, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 57191371, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (57191389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28595684 + 28595685.

It is an arithmetic number, because the mean of its divisors is an integer number (28595685).

Almost surely, 2^57191369 is an apocalyptic number.

It is an amenable number.

57191369 is a deficient number, since it is larger than the sum of its proper divisors (1).

57191369 is an equidigital number, since it uses as much as digits as its factorization.

57191369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51030, while the sum is 41.

The square root of 57191369 is about 7562.4975371897. The cubic root of 57191369 is about 385.2803243179.

The spelling of 57191369 in words is "fifty-seven million, one hundred ninety-one thousand, three hundred sixty-nine".