213932491 has 4 divisors (see below), whose sum is σ = 214263792. Its totient is φ = 213601192.

The previous prime is 213932489. The next prime is 213932497. The reversal of 213932491 is 194239312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 213932491 - 2¹ = 213932489 is a prime.

It is a super-2 number, since 2×213932491² = 91534221410930162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213932497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164680 + ... + 165973.

It is an arithmetic number, because the mean of its divisors is an integer number (53565948).

Almost surely, 2^213932491 is an apocalyptic number.

213932491 is a deficient number, since it is larger than the sum of its proper divisors (331301).

213932491 is an equidigital number, since it uses as much as digits as its factorization.

213932491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331300.

The product of its digits is 11664, while the sum is 34.

The square root of 213932491 is about 14626.4312462063. The cubic root of 213932491 is about 598.0794991678.

The spelling of 213932491 in words is "two hundred thirteen million, nine hundred thirty-two thousand, four hundred ninety-one".