31302225 has 18 divisors (see below), whose sum is σ = 56066166. Its totient is φ = 16694400.

The previous prime is 31302221. The next prime is 31302247. The reversal of 31302225 is 52220313.

It can be written as a sum of positive squares in 3 ways, for example, as 1096209 + 30206016 = 1047^2 + 5496^2 .

It is not a de Polignac number, because 31302225 - 2² = 31302221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31302198 and 31302207.

It is not an unprimeable number, because it can be changed into a prime (31302221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 69336 + ... + 69785.

It is an arithmetic number, because the mean of its divisors is an integer number (3114787).

Almost surely, 2^31302225 is an apocalyptic number.

It is an amenable number.

31302225 is a deficient number, since it is larger than the sum of its proper divisors (24763941).

31302225 is a wasteful number, since it uses less digits than its factorization.

31302225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139137 (or 139129 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 31302225 is about 5594.8391397787. The cubic root of 31302225 is about 315.1556298235.

Adding to 31302225 its reverse (52220313), we get a palindrome (83522538).

The spelling of 31302225 in words is "thirty-one million, three hundred two thousand, two hundred twenty-five".