191023057 has 2 divisors, whose sum is σ = 191023058. Its totient is φ = 191023056.

The previous prime is 191023043. The next prime is 191023069. The reversal of 191023057 is 750320191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 186076881 + 4946176 = 13641^2 + 2224^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191023057 is a prime.

It is not a weakly prime, because it can be changed into another prime (191023037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95511528 + 95511529.

It is an arithmetic number, because the mean of its divisors is an integer number (95511529).

Almost surely, 2^191023057 is an apocalyptic number.

It is an amenable number.

191023057 is a deficient number, since it is larger than the sum of its proper divisors (1).

191023057 is an equidigital number, since it uses as much as digits as its factorization.

191023057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 191023057 is about 13821.1091088957. The cubic root of 191023057 is about 575.9196946702.

The spelling of 191023057 in words is "one hundred ninety-one million, twenty-three thousand, fifty-seven".