125507731 has 2 divisors, whose sum is σ = 125507732. Its totient is φ = 125507730.

The previous prime is 125507699. The next prime is 125507779. The reversal of 125507731 is 137705521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 125507731 - 2⁵ = 125507699 is a prime.

It is a super-2 number, since 2×125507731² = 31504381081536722, which contains 22 as substring.

It is equal to p_7137391 and since 125507731 and 7137391 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 125507693 and 125507702.

It is not a weakly prime, because it can be changed into another prime (125502731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62753865 + 62753866.

It is an arithmetic number, because the mean of its divisors is an integer number (62753866).

Almost surely, 2^125507731 is an apocalyptic number.

125507731 is a deficient number, since it is larger than the sum of its proper divisors (1).

125507731 is an equidigital number, since it uses as much as digits as its factorization.

125507731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7350, while the sum is 31.

The square root of 125507731 is about 11203.0232973068. The cubic root of 125507731 is about 500.6760601400.

The spelling of 125507731 in words is "one hundred twenty-five million, five hundred seven thousand, seven hundred thirty-one".