191257057 has 2 divisors, whose sum is σ = 191257058. Its totient is φ = 191257056.

The previous prime is 191257049. The next prime is 191257063. The reversal of 191257057 is 750752191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 186076881 + 5180176 = 13641^2 + 2276^2 .

It is a cyclic number.

It is not a de Polignac number, because 191257057 - 2³ = 191257049 is a prime.

It is not a weakly prime, because it can be changed into another prime (191258057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95628528 + 95628529.

It is an arithmetic number, because the mean of its divisors is an integer number (95628529).

Almost surely, 2^191257057 is an apocalyptic number.

It is an amenable number.

191257057 is a deficient number, since it is larger than the sum of its proper divisors (1).

191257057 is an equidigital number, since it uses as much as digits as its factorization.

191257057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22050, while the sum is 37.

The square root of 191257057 is about 13829.5718299592. The cubic root of 191257057 is about 576.1547626593.

The spelling of 191257057 in words is "one hundred ninety-one million, two hundred fifty-seven thousand, fifty-seven".