213831955 has 16 divisors (see below), whose sum is σ = 266923008. Its totient is φ = 164268000.

The previous prime is 213831953. The next prime is 213831971. The reversal of 213831955 is 559138312.

It is a happy number.

It is not a de Polignac number, because 213831955 - 2¹ = 213831953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213831953) 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, 15040 + ... + 25570.

It is an arithmetic number, because the mean of its divisors is an integer number (16682688).

Almost surely, 2^213831955 is an apocalyptic number.

213831955 is a deficient number, since it is larger than the sum of its proper divisors (53091053).

213831955 is a wasteful number, since it uses less digits than its factorization.

213831955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10698.

The product of its digits is 32400, while the sum is 37.

The square root of 213831955 is about 14622.9940504672. The cubic root of 213831955 is about 597.9857968014.

The spelling of 213831955 in words is "two hundred thirteen million, eight hundred thirty-one thousand, nine hundred fifty-five".