191365157 has 2 divisors, whose sum is σ = 191365158. Its totient is φ = 191365156.

The previous prime is 191365127. The next prime is 191365231. The reversal of 191365157 is 751563191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 181467841 + 9897316 = 13471^2 + 3146^2 .

It is an emirp because it is prime and its reverse (751563191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 191365157 - 2¹⁰ = 191364133 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 191365157.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191365117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95682578 + 95682579.

It is an arithmetic number, because the mean of its divisors is an integer number (95682579).

Almost surely, 2^191365157 is an apocalyptic number.

It is an amenable number.

191365157 is a deficient number, since it is larger than the sum of its proper divisors (1).

191365157 is an equidigital number, since it uses as much as digits as its factorization.

191365157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28350, while the sum is 38.

The square root of 191365157 is about 13833.4795695082. The cubic root of 191365157 is about 576.2632912897.

The spelling of 191365157 in words is "one hundred ninety-one million, three hundred sixty-five thousand, one hundred fifty-seven".