231520125545 has 32 divisors (see below), whose sum is σ = 300016742400. Its totient is φ = 170987643904.

The previous prime is 231520125533. The next prime is 231520125547. The reversal of 231520125545 is 545521025132.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 231520125545 - 2⁶ = 231520125481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231520125547) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9589409 + ... + 9613521.

It is an arithmetic number, because the mean of its divisors is an integer number (9375523200).

Almost surely, 2^231520125545 is an apocalyptic number.

It is an amenable number.

231520125545 is a deficient number, since it is larger than the sum of its proper divisors (68496616855).

231520125545 is a wasteful number, since it uses less digits than its factorization.

231520125545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27049.

The product of its (nonzero) digits is 60000, while the sum is 35.

The spelling of 231520125545 in words is "two hundred thirty-one billion, five hundred twenty million, one hundred twenty-five thousand, five hundred forty-five".