213291999 has 6 divisors (see below), whose sum is σ = 308088456. Its totient is φ = 142194660.

The previous prime is 213291977. The next prime is 213292003. The reversal of 213291999 is 999192312.

It is a de Polignac number, because none of the positive numbers 2^k-213291999 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213291919) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11849547 + ... + 11849564.

It is an arithmetic number, because the mean of its divisors is an integer number (51348076).

Almost surely, 2^213291999 is an apocalyptic number.

213291999 is a deficient number, since it is larger than the sum of its proper divisors (94796457).

213291999 is a wasteful number, since it uses less digits than its factorization.

213291999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23699117 (or 23699114 counting only the distinct ones).

The product of its digits is 78732, while the sum is 45.

The square root of 213291999 is about 14604.5198140850. The cubic root of 213291999 is about 597.4820395738.

The spelling of 213291999 in words is "two hundred thirteen million, two hundred ninety-one thousand, nine hundred ninety-nine".