213131850 has 24 divisors (see below), whose sum is σ = 528567360. Its totient is φ = 56835120.

The previous prime is 213131843. The next prime is 213131861. The reversal of 213131850 is 58131312.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 213131850.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 710290 + ... + 710589.

It is an arithmetic number, because the mean of its divisors is an integer number (22023640).

Almost surely, 2^213131850 is an apocalyptic number.

213131850 is an abundant number, since it is smaller than the sum of its proper divisors (315435510).

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

213131850 is a wasteful number, since it uses less digits than its factorization.

213131850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1420894 (or 1420889 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 213131850 is about 14599.0359270741. The cubic root of 213131850 is about 597.3324635465.

The spelling of 213131850 in words is "two hundred thirteen million, one hundred thirty-one thousand, eight hundred fifty".