31230136 has 32 divisors (see below), whose sum is σ = 69834240. Its totient is φ = 12801888.

The previous prime is 31230079. The next prime is 31230163. The reversal of 31230136 is 63103213.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10836 + ... + 13411.

It is an arithmetic number, because the mean of its divisors is an integer number (2182320).

Almost surely, 2^31230136 is an apocalyptic number.

It is an amenable number.

31230136 is an abundant number, since it is smaller than the sum of its proper divisors (38604104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31230136 is a wasteful number, since it uses less digits than its factorization.

31230136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24283 (or 24279 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 31230136 is about 5588.3929711501. The cubic root of 31230136 is about 314.9135094700.

Adding to 31230136 its reverse (63103213), we get a palindrome (94333349).

The spelling of 31230136 in words is "thirty-one million, two hundred thirty thousand, one hundred thirty-six".