231664129225 has 9 divisors (see below), whose sum is σ = 287266504423. Its totient is φ = 185329378120.

The previous prime is 231664129219. The next prime is 231664129253. The reversal of 231664129225 is 522921466132.

The square root of 231664129225 is 481315.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 83399086521 + 148265042704 = 288789^2 + 385052^2 .

It is a de Polignac number, because none of the positive numbers 2^k-231664129225 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2358444 + ... + 2454706.

Almost surely, 2^231664129225 is an apocalyptic number.

231664129225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

231664129225 is the 481315-th square number.

231664129225 is the 240658-th centered octagonal number.

It is an amenable number.

231664129225 is a deficient number, since it is larger than the sum of its proper divisors (55602375198).

231664129225 is an frugal number, since it uses more digits than its factorization.

231664129225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192536 (or 96268 counting only the distinct ones).

The product of its digits is 311040, while the sum is 43.

The spelling of 231664129225 in words is "two hundred thirty-one billion, six hundred sixty-four million, one hundred twenty-nine thousand, two hundred twenty-five".