52857491 has 2 divisors, whose sum is σ = 52857492. Its totient is φ = 52857490.

The previous prime is 52857481. The next prime is 52857499. The reversal of 52857491 is 19475825.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-52857491 is a prime.

It is not a weakly prime, because it can be changed into another prime (52857499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26428745 + 26428746.

It is an arithmetic number, because the mean of its divisors is an integer number (26428746).

Almost surely, 2^52857491 is an apocalyptic number.

52857491 is a deficient number, since it is larger than the sum of its proper divisors (1).

52857491 is an equidigital number, since it uses as much as digits as its factorization.

52857491 is an evil number, because the sum of its binary digits is even.

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

The square root of 52857491 is about 7270.3157427996. The cubic root of 52857491 is about 375.2916037058.

The spelling of 52857491 in words is "fifty-two million, eight hundred fifty-seven thousand, four hundred ninety-one".