213805911 has 48 divisors (see below), whose sum is σ = 325584000. Its totient is φ = 124639680.

The previous prime is 213805901. The next prime is 213805919. The reversal of 213805911 is 119508312.

It is not a de Polignac number, because 213805911 - 2⁷ = 213805783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213805919) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1434865 + ... + 1435013.

It is an arithmetic number, because the mean of its divisors is an integer number (6783000).

Almost surely, 2^213805911 is an apocalyptic number.

213805911 is a deficient number, since it is larger than the sum of its proper divisors (111778089).

213805911 is a wasteful number, since it uses less digits than its factorization.

213805911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300 (or 289 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 30.

The square root of 213805911 is about 14622.1035080456. The cubic root of 213805911 is about 597.9615182748.

The spelling of 213805911 in words is "two hundred thirteen million, eight hundred five thousand, nine hundred eleven".