231520001545551 has 16 divisors (see below), whose sum is σ = 312971160587264. Its totient is φ = 152208419281344.

The previous prime is 231520001545529. The next prime is 231520001545577. The reversal of 231520001545551 is 155545100025132.

It is not a de Polignac number, because 231520001545551 - 2⁵ = 231520001545519 is a prime.

It is a super-2 number, since 2×231520001545551² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231520001555551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81625021 + ... + 84413766.

It is an arithmetic number, because the mean of its divisors is an integer number (19560697536704).

Almost surely, 2^{231520001545551} is an apocalyptic number.

231520001545551 is a deficient number, since it is larger than the sum of its proper divisors (81451159041713).

231520001545551 is a wasteful number, since it uses less digits than its factorization.

231520001545551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166045230.

The product of its (nonzero) digits is 150000, while the sum is 39.

The spelling of 231520001545551 in words is "two hundred thirty-one trillion, five hundred twenty billion, one million, five hundred forty-five thousand, five hundred fifty-one".