31532013 has 6 divisors (see below), whose sum is σ = 45546254. Its totient is φ = 21021336.

The previous prime is 31532003. The next prime is 31532021. The reversal of 31532013 is 31023513.

It can be written as a sum of positive squares in only one way, i.e., 31505769 + 26244 = 5613^2 + 162^2 .

It is not a de Polignac number, because 31532013 - 2¹⁴ = 31515629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31532003) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1751770 + ... + 1751787.

Almost surely, 2^31532013 is an apocalyptic number.

It is an amenable number.

31532013 is a deficient number, since it is larger than the sum of its proper divisors (14014241).

31532013 is a wasteful number, since it uses less digits than its factorization.

31532013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3503563 (or 3503560 counting only the distinct ones).

The product of its (nonzero) digits is 270, while the sum is 18.

The square root of 31532013 is about 5615.3373006437. The cubic root of 31532013 is about 315.9249307605.

Adding to 31532013 its reverse (31023513), we get a palindrome (62555526).

The spelling of 31532013 in words is "thirty-one million, five hundred thirty-two thousand, thirteen".