125131621521 has 8 divisors (see below), whose sum is σ = 166919663520. Its totient is φ = 83382330272.

The previous prime is 125131621513. The next prime is 125131621541. The reversal of 125131621521 is 125126131521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 125131621521 - 2³ = 125131621513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (125131621541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9680151 + ... + 9693068.

It is an arithmetic number, because the mean of its divisors is an integer number (20864957940).

Almost surely, 2^125131621521 is an apocalyptic number.

It is an amenable number.

125131621521 is a deficient number, since it is larger than the sum of its proper divisors (41788041999).

125131621521 is a wasteful number, since it uses less digits than its factorization.

125131621521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19375375.

The product of its digits is 3600, while the sum is 30.

The spelling of 125131621521 in words is "one hundred twenty-five billion, one hundred thirty-one million, six hundred twenty-one thousand, five hundred twenty-one".