125921507 has 16 divisors (see below), whose sum is σ = 131991552. Its totient is φ = 120037920.

The previous prime is 125921503. The next prime is 125921599. The reversal of 125921507 is 705129521.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 125921507 - 2² = 125921503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125921503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 478658 + ... + 478920.

It is an arithmetic number, because the mean of its divisors is an integer number (8249472).

Almost surely, 2^125921507 is an apocalyptic number.

125921507 is a deficient number, since it is larger than the sum of its proper divisors (6070045).

125921507 is a wasteful number, since it uses less digits than its factorization.

125921507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538.

The product of its (nonzero) digits is 6300, while the sum is 32.

The square root of 125921507 is about 11221.4752595191. The cubic root of 125921507 is about 501.2256690159.

The spelling of 125921507 in words is "one hundred twenty-five million, nine hundred twenty-one thousand, five hundred seven".