557287531 has 2 divisors, whose sum is σ = 557287532. Its totient is φ = 557287530.

The previous prime is 557287529. The next prime is 557287541. The reversal of 557287531 is 135782755.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 557287531 - 2¹ = 557287529 is a prime.

It is a super-2 number, since 2×557287531² = 621138784416151922, which contains 22 as substring.

Together with 557287529, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (557287501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278643765 + 278643766.

It is an arithmetic number, because the mean of its divisors is an integer number (278643766).

Almost surely, 2^557287531 is an apocalyptic number.

557287531 is a deficient number, since it is larger than the sum of its proper divisors (1).

557287531 is an equidigital number, since it uses as much as digits as its factorization.

557287531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 294000, while the sum is 43.

The square root of 557287531 is about 23606.9381962168. The cubic root of 557287531 is about 822.9240889695.

The spelling of 557287531 in words is "five hundred fifty-seven million, two hundred eighty-seven thousand, five hundred thirty-one".