213797191 has 2 divisors, whose sum is σ = 213797192. Its totient is φ = 213797190.

The previous prime is 213797183. The next prime is 213797197. The reversal of 213797191 is 191797312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 213797191 - 2³ = 213797183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213797197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106898595 + 106898596.

It is an arithmetic number, because the mean of its divisors is an integer number (106898596).

Almost surely, 2^213797191 is an apocalyptic number.

213797191 is a deficient number, since it is larger than the sum of its proper divisors (1).

213797191 is an equidigital number, since it uses as much as digits as its factorization.

213797191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23814, while the sum is 40.

The square root of 213797191 is about 14621.8053262926. The cubic root of 213797191 is about 597.9533889465.

The spelling of 213797191 in words is "two hundred thirteen million, seven hundred ninety-seven thousand, one hundred ninety-one".