125981507 has 4 divisors (see below), whose sum is σ = 127861896. Its totient is φ = 124101120.

The previous prime is 125981483. The next prime is 125981519. The reversal of 125981507 is 705189521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 705189521 = 157 ⋅4491653.

It is a cyclic number.

It is not a de Polignac number, because 125981507 - 2²² = 121787203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125981567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 940094 + ... + 940227.

It is an arithmetic number, because the mean of its divisors is an integer number (31965474).

Almost surely, 2^125981507 is an apocalyptic number.

125981507 is a deficient number, since it is larger than the sum of its proper divisors (1880389).

125981507 is an equidigital number, since it uses as much as digits as its factorization.

125981507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1880388.

The product of its (nonzero) digits is 25200, while the sum is 38.

The square root of 125981507 is about 11224.1483864033. The cubic root of 125981507 is about 501.3052655984.

The spelling of 125981507 in words is "one hundred twenty-five million, nine hundred eighty-one thousand, five hundred seven".