125540507 has 4 divisors (see below), whose sum is σ = 129869520. Its totient is φ = 121211496.

The previous prime is 125540489. The next prime is 125540537. The reversal of 125540507 is 705045521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 705045521 = 19 ⋅37107659.

It is a cyclic number.

It is not a de Polignac number, because 125540507 - 2²⁰ = 124491931 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 4328983 = 125540507 / (1 + 2 + 5 + 5 + 4 + 0 + 5 + 0 + 7).

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 125540507.

It is not an unprimeable number, because it can be changed into a prime (125540537) 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 3 ways as a sum of consecutive naturals, for example, 2164463 + ... + 2164520.

It is an arithmetic number, because the mean of its divisors is an integer number (32467380).

Almost surely, 2^125540507 is an apocalyptic number.

125540507 is a deficient number, since it is larger than the sum of its proper divisors (4329013).

125540507 is an equidigital number, since it uses as much as digits as its factorization.

125540507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4329012.

The product of its (nonzero) digits is 7000, while the sum is 29.

The square root of 125540507 is about 11204.4860212327. The cubic root of 125540507 is about 500.7196397404.

The spelling of 125540507 in words is "one hundred twenty-five million, five hundred forty thousand, five hundred seven".