191057 has 2 divisors, whose sum is σ = 191058. Its totient is φ = 191056.

The previous prime is 191047. The next prime is 191071. The reversal of 191057 is 750191.

191057 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 190096 + 961 = 436^2 + 31^2 .

It is a cyclic number.

It is not a de Polignac number, because 191057 - 2¹⁴ = 174673 is a prime.

It is a super-3 number, since 3×191057³ = 20922333338586579, which contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (191027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95528 + 95529.

It is an arithmetic number, because the mean of its divisors is an integer number (95529).

2¹⁹¹⁰⁵⁷ is an apocalyptic number.

It is an amenable number.

191057 is a deficient number, since it is larger than the sum of its proper divisors (1).

191057 is an equidigital number, since it uses as much as digits as its factorization.

191057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 315, while the sum is 23.

The square root of 191057 is about 437.1006749022. The cubic root of 191057 is about 57.5953804487.

The spelling of 191057 in words is "one hundred ninety-one thousand, fifty-seven".