213131382 has 16 divisors (see below), whose sum is σ = 440961840. Its totient is φ = 68593952.

The previous prime is 213131371. The next prime is 213131393. The reversal of 213131382 is 283131312.

It is an interprime number because it is at equal distance from previous prime (213131371) and next prime (213131393).

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, 612273 + ... + 612620.

It is an arithmetic number, because the mean of its divisors is an integer number (27560115).

Almost surely, 2^213131382 is an apocalyptic number.

213131382 is an abundant number, since it is smaller than the sum of its proper divisors (227830458).

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

213131382 is a wasteful number, since it uses less digits than its factorization.

213131382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1224927.

The product of its digits is 864, while the sum is 24.

The square root of 213131382 is about 14599.0198986096. The cubic root of 213131382 is about 597.3320263339.

Adding to 213131382 its reverse (283131312), we get a palindrome (496262694).

The spelling of 213131382 in words is "two hundred thirteen million, one hundred thirty-one thousand, three hundred eighty-two".