213730591 has 2 divisors, whose sum is σ = 213730592. Its totient is φ = 213730590.

The previous prime is 213730589. The next prime is 213730669. The reversal of 213730591 is 195037312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 213730591 - 2¹ = 213730589 is a prime.

Together with 213730589, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213730541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106865295 + 106865296.

It is an arithmetic number, because the mean of its divisors is an integer number (106865296).

Almost surely, 2^213730591 is an apocalyptic number.

213730591 is a deficient number, since it is larger than the sum of its proper divisors (1).

213730591 is an equidigital number, since it uses as much as digits as its factorization.

213730591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5670, while the sum is 31.

The square root of 213730591 is about 14619.5277283502. The cubic root of 213730591 is about 597.8912929770.

The spelling of 213730591 in words is "two hundred thirteen million, seven hundred thirty thousand, five hundred ninety-one".