125161631 has 6 divisors (see below), whose sum is σ = 145596240. Its totient is φ = 107281356.

The previous prime is 125161571. The next prime is 125161637. The reversal of 125161631 is 136161521.

It is not a de Polignac number, because 125161631 - 2¹⁸ = 124899487 is a prime.

It is a super-2 number, since 2×125161631² = 31330867749160322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 125161631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125161637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1277111 + ... + 1277208.

It is an arithmetic number, because the mean of its divisors is an integer number (24266040).

Almost surely, 2^125161631 is an apocalyptic number.

125161631 is a deficient number, since it is larger than the sum of its proper divisors (20434609).

125161631 is an equidigital number, since it uses as much as digits as its factorization.

125161631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2554333 (or 2554326 counting only the distinct ones).

The product of its digits is 1080, while the sum is 26.

The square root of 125161631 is about 11187.5659104204. The cubic root of 125161631 is about 500.2154151793.

The spelling of 125161631 in words is "one hundred twenty-five million, one hundred sixty-one thousand, six hundred thirty-one".