57642251 has 2 divisors, whose sum is σ = 57642252. Its totient is φ = 57642250.

The previous prime is 57642203. The next prime is 57642293. The reversal of 57642251 is 15224675.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57642251 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (57642551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28821125 + 28821126.

It is an arithmetic number, because the mean of its divisors is an integer number (28821126).

Almost surely, 2^57642251 is an apocalyptic number.

57642251 is a deficient number, since it is larger than the sum of its proper divisors (1).

57642251 is an equidigital number, since it uses as much as digits as its factorization.

57642251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16800, while the sum is 32.

The square root of 57642251 is about 7592.2494031743. The cubic root of 57642251 is about 386.2901587540.

The spelling of 57642251 in words is "fifty-seven million, six hundred forty-two thousand, two hundred fifty-one".