31225156 has 6 divisors (see below), whose sum is σ = 54644030. Its totient is φ = 15612576.

The previous prime is 31225147. The next prime is 31225157. The reversal of 31225156 is 65152213.

It can be written as a sum of positive squares in only one way, i.e., 31181056 + 44100 = 5584^2 + 210^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31225156.

It is not an unprimeable number, because it can be changed into a prime (31225157) 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 as a sum of consecutive naturals, namely, 3903141 + ... + 3903148.

Almost surely, 2^31225156 is an apocalyptic number.

It is an amenable number.

31225156 is a deficient number, since it is larger than the sum of its proper divisors (23418874).

31225156 is a wasteful number, since it uses less digits than its factorization.

31225156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7806293 (or 7806291 counting only the distinct ones).

The product of its digits is 1800, while the sum is 25.

The square root of 31225156 is about 5587.9473870107. The cubic root of 31225156 is about 314.8967697345.

Adding to 31225156 its reverse (65152213), we get a palindrome (96377369).

The spelling of 31225156 in words is "thirty-one million, two hundred twenty-five thousand, one hundred fifty-six".