31836213 has 16 divisors (see below), whose sum is σ = 48316800. Its totient is φ = 20705760.

The previous prime is 31836179. The next prime is 31836221. The reversal of 31836213 is 31263813.

It is a happy number.

31836213 is a `hidden beast` number, since 31 + 8 + 3 + 621 + 3 = 666.

It is not a de Polignac number, because 31836213 - 2¹⁰ = 31835189 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31836253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13273 + ... + 15486.

It is an arithmetic number, because the mean of its divisors is an integer number (3019800).

Almost surely, 2^31836213 is an apocalyptic number.

It is an amenable number.

31836213 is a deficient number, since it is larger than the sum of its proper divisors (16480587).

31836213 is a wasteful number, since it uses less digits than its factorization.

31836213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28809 (or 28803 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 31836213 is about 5642.3588152474. The cubic root of 31836213 is about 316.9376260100.

The spelling of 31836213 in words is "thirty-one million, eight hundred thirty-six thousand, two hundred thirteen".