125126131521 has 8 divisors (see below), whose sum is σ = 166840190464. Its totient is φ = 83414746800.

The previous prime is 125126131519. The next prime is 125126131531. The reversal of 125126131521 is 125131621521.

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

It is not a de Polignac number, because 125126131521 - 2¹ = 125126131519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125126131531) 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 7 ways as a sum of consecutive naturals, for example, 556705 + ... + 748446.

It is an arithmetic number, because the mean of its divisors is an integer number (20855023808).

Almost surely, 2^125126131521 is an apocalyptic number.

It is an amenable number.

125126131521 is a deficient number, since it is larger than the sum of its proper divisors (41714058943).

125126131521 is a wasteful number, since it uses less digits than its factorization.

125126131521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1337111.

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

The spelling of 125126131521 in words is "one hundred twenty-five billion, one hundred twenty-six million, one hundred thirty-one thousand, five hundred twenty-one".