57285491 has 2 divisors, whose sum is σ = 57285492. Its totient is φ = 57285490.

The previous prime is 57285457. The next prime is 57285497. The reversal of 57285491 is 19458275.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 57285491 - 2¹⁸ = 57023347 is a prime.

It is a super-2 number, since 2×57285491² = 6563254958222162, which contains 22 as substring.

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 (57285497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28642745 + 28642746.

It is an arithmetic number, because the mean of its divisors is an integer number (28642746).

Almost surely, 2^57285491 is an apocalyptic number.

57285491 is a deficient number, since it is larger than the sum of its proper divisors (1).

57285491 is an equidigital number, since it uses as much as digits as its factorization.

57285491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 100800, while the sum is 41.

The square root of 57285491 is about 7568.7179231360. The cubic root of 57285491 is about 385.4915652806.

The spelling of 57285491 in words is "fifty-seven million, two hundred eighty-five thousand, four hundred ninety-one".