31131332 has 12 divisors (see below), whose sum is σ = 54878460. Its totient is φ = 15451776.

The previous prime is 31131323. The next prime is 31131337. The reversal of 31131332 is 23313113.

It can be written as a sum of positive squares in 2 ways, for example, as 6071296 + 25060036 = 2464^2 + 5006^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31131332.

It is not an unprimeable number, because it can be changed into a prime (31131337) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27857 + ... + 28952.

It is an arithmetic number, because the mean of its divisors is an integer number (4573205).

Almost surely, 2^31131332 is an apocalyptic number.

It is an amenable number.

31131332 is a deficient number, since it is larger than the sum of its proper divisors (23747128).

31131332 is a wasteful number, since it uses less digits than its factorization.

31131332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56950 (or 56948 counting only the distinct ones).

The product of its digits is 162, while the sum is 17.

The square root of 31131332 is about 5579.5458596556. The cubic root of 31131332 is about 314.5810572393.

Adding to 31131332 its reverse (23313113), we get a palindrome (54444445).

The spelling of 31131332 in words is "thirty-one million, one hundred thirty-one thousand, three hundred thirty-two".