125555531 has 2 divisors, whose sum is σ = 125555532. Its totient is φ = 125555530.

The previous prime is 125555527. The next prime is 125555567. The reversal of 125555531 is 135555521.

It is a weak prime.

It is an emirp because it is prime and its reverse (135555521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 125555531 - 2² = 125555527 is a prime.

It is a super-2 number, since 2×125555531² = 31528382729383922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (125555501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62777765 + 62777766.

It is an arithmetic number, because the mean of its divisors is an integer number (62777766).

Almost surely, 2^125555531 is an apocalyptic number.

125555531 is a deficient number, since it is larger than the sum of its proper divisors (1).

125555531 is an equidigital number, since it uses as much as digits as its factorization.

125555531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18750, while the sum is 32.

The square root of 125555531 is about 11205.1564469221. The cubic root of 125555531 is about 500.7396134046.

The spelling of 125555531 in words is "one hundred twenty-five million, five hundred fifty-five thousand, five hundred thirty-one".