191795657 has 2 divisors, whose sum is σ = 191795658. Its totient is φ = 191795656.

The previous prime is 191795627. The next prime is 191795677. The reversal of 191795657 is 756597191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140873161 + 50922496 = 11869^2 + 7136^2 .

It is a cyclic number.

It is not a de Polignac number, because 191795657 - 2¹⁸ = 191533513 is a prime.

It is not a weakly prime, because it can be changed into another prime (191795627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95897828 + 95897829.

It is an arithmetic number, because the mean of its divisors is an integer number (95897829).

Almost surely, 2^191795657 is an apocalyptic number.

It is an amenable number.

191795657 is a deficient number, since it is larger than the sum of its proper divisors (1).

191795657 is an equidigital number, since it uses as much as digits as its factorization.

191795657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 595350, while the sum is 50.

The square root of 191795657 is about 13849.0309047240. The cubic root of 191795657 is about 576.6950932486.

The spelling of 191795657 in words is "one hundred ninety-one million, seven hundred ninety-five thousand, six hundred fifty-seven".