213315491 has 2 divisors, whose sum is σ = 213315492. Its totient is φ = 213315490.

The previous prime is 213315437. The next prime is 213315493. The reversal of 213315491 is 194513312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213315491 is a prime.

Together with 213315493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (213315493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106657745 + 106657746.

It is an arithmetic number, because the mean of its divisors is an integer number (106657746).

Almost surely, 2^213315491 is an apocalyptic number.

213315491 is a deficient number, since it is larger than the sum of its proper divisors (1).

213315491 is an equidigital number, since it uses as much as digits as its factorization.

213315491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 29.

The square root of 213315491 is about 14605.3240635051. The cubic root of 213315491 is about 597.5039743438.

The spelling of 213315491 in words is "two hundred thirteen million, three hundred fifteen thousand, four hundred ninety-one".