213312591 has 12 divisors (see below), whose sum is σ = 308767680. Its totient is φ = 141908640.

The previous prime is 213312577. The next prime is 213312599. The reversal of 213312591 is 195213312.

It is not a de Polignac number, because 213312591 - 2⁶ = 213312527 is a prime.

It is a super-2 number, since 2×213312591² = 91004522958266562, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213312599) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20430 + ... + 29051.

It is an arithmetic number, because the mean of its divisors is an integer number (25730640).

Almost surely, 2^213312591 is an apocalyptic number.

213312591 is a deficient number, since it is larger than the sum of its proper divisors (95455089).

213312591 is a wasteful number, since it uses less digits than its factorization.

213312591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49966 (or 49963 counting only the distinct ones).

The product of its digits is 1620, while the sum is 27.

The square root of 213312591 is about 14605.2247843024. The cubic root of 213312591 is about 597.5012666651.

The spelling of 213312591 in words is "two hundred thirteen million, three hundred twelve thousand, five hundred ninety-one".