31136493 has 16 divisors (see below), whose sum is σ = 43670016. Its totient is φ = 19705920.

The previous prime is 31136491. The next prime is 31136531. The reversal of 31136493 is 39463113.

It is not a de Polignac number, because 31136493 - 2¹ = 31136491 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31136493.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31136491) 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, 1771 + ... + 8087.

It is an arithmetic number, because the mean of its divisors is an integer number (2729376).

Almost surely, 2^31136493 is an apocalyptic number.

It is an amenable number.

31136493 is a deficient number, since it is larger than the sum of its proper divisors (12533523).

31136493 is a wasteful number, since it uses less digits than its factorization.

31136493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6404.

The product of its digits is 5832, while the sum is 30.

The square root of 31136493 is about 5580.0083333271. The cubic root of 31136493 is about 314.5984401889.

The spelling of 31136493 in words is "thirty-one million, one hundred thirty-six thousand, four hundred ninety-three".