31630013 has 16 divisors (see below), whose sum is σ = 35334144. Its totient is φ = 28174080.

The previous prime is 31630007. The next prime is 31630019. The reversal of 31630013 is 31003613.

It is an interprime number because it is at equal distance from previous prime (31630007) and next prime (31630019).

It is a cyclic number.

It is not a de Polignac number, because 31630013 - 2¹² = 31625917 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31629973 and 31630000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31630019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24131 + ... + 25407.

It is an arithmetic number, because the mean of its divisors is an integer number (2208384).

Almost surely, 2^31630013 is an apocalyptic number.

It is an amenable number.

31630013 is a deficient number, since it is larger than the sum of its proper divisors (3704131).

31630013 is a wasteful number, since it uses less digits than its factorization.

31630013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1372.

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

The square root of 31630013 is about 5624.0566320051. The cubic root of 31630013 is about 316.2518855049.

Adding to 31630013 its reverse (31003613), we get a palindrome (62633626).

The spelling of 31630013 in words is "thirty-one million, six hundred thirty thousand, thirteen".