55231225 has 24 divisors (see below), whose sum is σ = 80976960. Its totient is φ = 36563520.

The previous prime is 55231219. The next prime is 55231259. The reversal of 55231225 is 52213255.

It is a happy number.

It is not a de Polignac number, because 55231225 - 2⁵ = 55231193 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a self number, because there is not a number n which added to its sum of digits gives 55231225.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 367 + ... + 10516.

It is an arithmetic number, because the mean of its divisors is an integer number (3374040).

Almost surely, 2^55231225 is an apocalyptic number.

It is an amenable number.

55231225 is a deficient number, since it is larger than the sum of its proper divisors (25745735).

55231225 is a wasteful number, since it uses less digits than its factorization.

55231225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10929 (or 10924 counting only the distinct ones).

The product of its digits is 3000, while the sum is 25.

The square root of 55231225 is about 7431.7713231773. The cubic root of 55231225 is about 380.8274329131.

The spelling of 55231225 in words is "fifty-five million, two hundred thirty-one thousand, two hundred twenty-five".