231554320225 has 6 divisors (see below), whose sum is σ = 287127357110. Its totient is φ = 185243456160.

The previous prime is 231554320201. The next prime is 231554320229. The reversal of 231554320225 is 522023455132.

It can be written as a sum of positive squares in 3 ways, for example, as 75585405184 + 155968915041 = 274928^2 + 394929^2 .

It is not a de Polignac number, because 231554320225 - 2¹⁵ = 231554287457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231554320229) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4631086380 + ... + 4631086429.

Almost surely, 2^231554320225 is an apocalyptic number.

231554320225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

231554320225 is a deficient number, since it is larger than the sum of its proper divisors (55573036885).

231554320225 is an equidigital number, since it uses as much as digits as its factorization.

231554320225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9262172819 (or 9262172814 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 34.

Adding to 231554320225 its reverse (522023455132), we get a palindrome (753577775357).

The spelling of 231554320225 in words is "two hundred thirty-one billion, five hundred fifty-four million, three hundred twenty thousand, two hundred twenty-five".