31288225 has 6 divisors (see below), whose sum is σ = 38797430. Its totient is φ = 25030560.

The previous prime is 31288183. The next prime is 31288237. The reversal of 31288225 is 52288213.

It can be written as a sum of positive squares in 3 ways, for example, as 118336 + 31169889 = 344^2 + 5583^2 .

It is not a de Polignac number, because 31288225 - 2¹³ = 31280033 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 625740 + ... + 625789.

Almost surely, 2^31288225 is an apocalyptic number.

It is an amenable number.

31288225 is a deficient number, since it is larger than the sum of its proper divisors (7509205).

31288225 is a wasteful number, since it uses less digits than its factorization.

31288225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1251539 (or 1251534 counting only the distinct ones).

The product of its digits is 7680, while the sum is 31.

The square root of 31288225 is about 5593.5878468117. The cubic root of 31288225 is about 315.1086380973.

It can be divided in two parts, 31288 and 225, that added together give a palindrome (31513).

The spelling of 31288225 in words is "thirty-one million, two hundred eighty-eight thousand, two hundred twenty-five".