191302231 has 2 divisors, whose sum is σ = 191302232. Its totient is φ = 191302230.

The previous prime is 191302229. The next prime is 191302273. The reversal of 191302231 is 132203191.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 191302231 - 2¹ = 191302229 is a prime.

It is a super-2 number, since 2×191302231² = 73193087171154722, which contains 22 as substring.

Together with 191302229, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191302211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95651115 + 95651116.

It is an arithmetic number, because the mean of its divisors is an integer number (95651116).

Almost surely, 2^191302231 is an apocalyptic number.

191302231 is a deficient number, since it is larger than the sum of its proper divisors (1).

191302231 is an equidigital number, since it uses as much as digits as its factorization.

191302231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 191302231 is about 13831.2049728142. The cubic root of 191302231 is about 576.2001207527.

The spelling of 191302231 in words is "one hundred ninety-one million, three hundred two thousand, two hundred thirty-one".