191396213 has 2 divisors, whose sum is σ = 191396214. Its totient is φ = 191396212.

The previous prime is 191396171. The next prime is 191396221. The reversal of 191396213 is 312693191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109348849 + 82047364 = 10457^2 + 9058^2 .

It is an emirp because it is prime and its reverse (312693191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 191396213 - 2⁸ = 191395957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191396273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95698106 + 95698107.

It is an arithmetic number, because the mean of its divisors is an integer number (95698107).

Almost surely, 2^191396213 is an apocalyptic number.

It is an amenable number.

191396213 is a deficient number, since it is larger than the sum of its proper divisors (1).

191396213 is an equidigital number, since it uses as much as digits as its factorization.

191396213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8748, while the sum is 35.

The square root of 191396213 is about 13834.6020181283. The cubic root of 191396213 is about 576.2944628729.

It can be divided in two parts, 19139 and 6213, that added together give a palindrome (25352).

The spelling of 191396213 in words is "one hundred ninety-one million, three hundred ninety-six thousand, two hundred thirteen".