125515031 has 2 divisors, whose sum is σ = 125515032. Its totient is φ = 125515030.

The previous prime is 125515021. The next prime is 125515043. The reversal of 125515031 is 130515521.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 125515031 - 2¹⁰ = 125514007 is a prime.

It is a super-2 number, since 2×125515031² = 31508046013861922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 125514988 and 125515006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125515021) 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 as a sum of consecutive naturals, namely, 62757515 + 62757516.

It is an arithmetic number, because the mean of its divisors is an integer number (62757516).

Almost surely, 2^125515031 is an apocalyptic number.

125515031 is a deficient number, since it is larger than the sum of its proper divisors (1).

125515031 is an equidigital number, since it uses as much as digits as its factorization.

125515031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 750, while the sum is 23.

The square root of 125515031 is about 11203.3490974797. The cubic root of 125515031 is about 500.6857670172.

The spelling of 125515031 in words is "one hundred twenty-five million, five hundred fifteen thousand, thirty-one".