31521412 has 12 divisors (see below), whose sum is σ = 59405836. Its totient is φ = 14548320.

The previous prime is 31521409. The next prime is 31521419. The reversal of 31521412 is 21412513.

It can be written as a sum of positive squares in 2 ways, for example, as 13424896 + 18096516 = 3664^2 + 4254^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31521412.

It is not an unprimeable number, because it can be changed into a prime (31521419) 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, 303039 + ... + 303142.

Almost surely, 2^31521412 is an apocalyptic number.

It is an amenable number.

31521412 is a deficient number, since it is larger than the sum of its proper divisors (27884424).

31521412 is a wasteful number, since it uses less digits than its factorization.

31521412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606198 (or 606196 counting only the distinct ones).

The product of its digits is 240, while the sum is 19.

The square root of 31521412 is about 5614.3932886822. The cubic root of 31521412 is about 315.8895223479.

Adding to 31521412 its reverse (21412513), we get a palindrome (52933925).

The spelling of 31521412 in words is "thirty-one million, five hundred twenty-one thousand, four hundred twelve".