231155225 has 12 divisors (see below), whose sum is σ = 327580224. Its totient is φ = 158506320.

The previous prime is 231155219. The next prime is 231155233. The reversal of 231155225 is 522551132.

231155225 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 231155225 - 2⁴ = 231155209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231155194 and 231155203.

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, 660269 + ... + 660618.

It is an arithmetic number, because the mean of its divisors is an integer number (27298352).

Almost surely, 2^231155225 is an apocalyptic number.

231155225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

231155225 is a deficient number, since it is larger than the sum of its proper divisors (96424999).

231155225 is a wasteful number, since it uses less digits than its factorization.

231155225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1320904 (or 1320899 counting only the distinct ones).

The product of its digits is 3000, while the sum is 26.

The square root of 231155225 is about 15203.7898235933. The cubic root of 231155225 is about 613.7166487464.

The spelling of 231155225 in words is "two hundred thirty-one million, one hundred fifty-five thousand, two hundred twenty-five".