31213196 has 36 divisors (see below), whose sum is σ = 63996408. Its totient is φ = 13281408.

The previous prime is 31213159. The next prime is 31213201. The reversal of 31213196 is 69131213.

31213196 = 774² + 775² + ... + 822².

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31460 + ... + 32436.

It is an arithmetic number, because the mean of its divisors is an integer number (1777678).

Almost surely, 2^31213196 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31213196, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31998204).

31213196 is an abundant number, since it is smaller than the sum of its proper divisors (32783212).

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

31213196 is a wasteful number, since it uses less digits than its factorization.

31213196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1158 (or 1149 counting only the distinct ones).

The product of its digits is 972, while the sum is 26.

The square root of 31213196 is about 5586.8771241186. The cubic root of 31213196 is about 314.8565602069.

The spelling of 31213196 in words is "thirty-one million, two hundred thirteen thousand, one hundred ninety-six".