57645391 has 2 divisors, whose sum is σ = 57645392. Its totient is φ = 57645390.

The previous prime is 57645361. The next prime is 57645403. The reversal of 57645391 is 19354675.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 57645391 - 2¹¹ = 57643343 is a prime.

It is a super-2 number, since 2×57645391² = 6645982207085762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57645311) 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, 28822695 + 28822696.

It is an arithmetic number, because the mean of its divisors is an integer number (28822696).

Almost surely, 2^57645391 is an apocalyptic number.

57645391 is a deficient number, since it is larger than the sum of its proper divisors (1).

57645391 is an equidigital number, since it uses as much as digits as its factorization.

57645391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 113400, while the sum is 40.

The square root of 57645391 is about 7592.4561901930. The cubic root of 57645391 is about 386.2971728744.

The spelling of 57645391 in words is "fifty-seven million, six hundred forty-five thousand, three hundred ninety-one".