191257049 has 2 divisors, whose sum is σ = 191257050. Its totient is φ = 191257048.

The previous prime is 191256977. The next prime is 191257057. The reversal of 191257049 is 940752191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 168169024 + 23088025 = 12968^2 + 4805^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191257049 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (191257849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95628524 + 95628525.

It is an arithmetic number, because the mean of its divisors is an integer number (95628525).

Almost surely, 2^191257049 is an apocalyptic number.

It is an amenable number.

191257049 is a deficient number, since it is larger than the sum of its proper divisors (1).

191257049 is an equidigital number, since it uses as much as digits as its factorization.

191257049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 38.

The square root of 191257049 is about 13829.5715407239. The cubic root of 191257049 is about 576.1547546260.

The spelling of 191257049 in words is "one hundred ninety-one million, two hundred fifty-seven thousand, forty-nine".