231555725 has 12 divisors (see below), whose sum is σ = 304019604. Its totient is φ = 174347520.

The previous prime is 231555719. The next prime is 231555739. The reversal of 231555725 is 527555132.

It is a happy number.

231555725 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 3334276 + 228221449 = 1826^2 + 15107^2 .

It is not a de Polignac number, because 231555725 - 2²⁶ = 164446861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 271994 + ... + 272843.

It is an arithmetic number, because the mean of its divisors is an integer number (25334967).

Almost surely, 2^231555725 is an apocalyptic number.

231555725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

231555725 is a deficient number, since it is larger than the sum of its proper divisors (72463879).

231555725 is a wasteful number, since it uses less digits than its factorization.

231555725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544864 (or 544859 counting only the distinct ones).

The product of its digits is 52500, while the sum is 35.

The square root of 231555725 is about 15216.9551816387. The cubic root of 231555725 is about 614.0708864672.

The spelling of 231555725 in words is "two hundred thirty-one million, five hundred fifty-five thousand, seven hundred twenty-five".