231515555445225 has 192 divisors, whose sum is σ = 429839820633600. Its totient is φ = 122165245440000.

The previous prime is 231515555445199. The next prime is 231515555445283. The reversal of 231515555445225 is 522544555515132.

It is a happy number.

231515555445225 is a `hidden beast` number, since 2 + 3 + 1 + 5 + 15 + 5 + 554 + 4 + 52 + 25 = 666.

It is not a de Polignac number, because 231515555445225 - 2¹¹ = 231515555443177 is a prime.

It is a super-2 number, since 2×231515555445225² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 30172751989 + ... + 30172759661.

It is an arithmetic number, because the mean of its divisors is an integer number (2238749065800).

Almost surely, 2^{231515555445225} is an apocalyptic number.

231515555445225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

231515555445225 is a deficient number, since it is larger than the sum of its proper divisors (198324265188375).

231515555445225 is a wasteful number, since it uses less digits than its factorization.

231515555445225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8993 (or 8982 counting only the distinct ones).

The product of its digits is 30000000, while the sum is 54.

The spelling of 231515555445225 in words is "two hundred thirty-one trillion, five hundred fifteen billion, five hundred fifty-five million, four hundred forty-five thousand, two hundred twenty-five".