31366225 has 18 divisors (see below), whose sum is σ = 42755510. Its totient is φ = 22809600.

The previous prime is 31366219. The next prime is 31366259. The reversal of 31366225 is 52266313.

It can be written as a sum of positive squares in 3 ways, for example, as 17424 + 31348801 = 132^2 + 5599^2 .

It is not a de Polignac number, because 31366225 - 2³ = 31366217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31366193 and 31366202.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2160 + ... + 8209.

Almost surely, 2^31366225 is an apocalyptic number.

It is an amenable number.

31366225 is a deficient number, since it is larger than the sum of its proper divisors (11389285).

31366225 is a wasteful number, since it uses less digits than its factorization.

31366225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10401 (or 10385 counting only the distinct ones).

The product of its digits is 6480, while the sum is 28.

The square root of 31366225 is about 5600.5557759922. Note that the first 3 decimals coincide. The cubic root of 31366225 is about 315.3702708969.

The spelling of 31366225 in words is "thirty-one million, three hundred sixty-six thousand, two hundred twenty-five".