191186057 has 2 divisors, whose sum is σ = 191186058. Its totient is φ = 191186056.

The previous prime is 191186011. The next prime is 191186077. The reversal of 191186057 is 750681191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116726416 + 74459641 = 10804^2 + 8629^2 .

It is a cyclic number.

It is not a de Polignac number, because 191186057 - 2¹² = 191181961 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 191186057.

It is not a weakly prime, because it can be changed into another prime (191186077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95593028 + 95593029.

It is an arithmetic number, because the mean of its divisors is an integer number (95593029).

Almost surely, 2^191186057 is an apocalyptic number.

It is an amenable number.

191186057 is a deficient number, since it is larger than the sum of its proper divisors (1).

191186057 is an equidigital number, since it uses as much as digits as its factorization.

191186057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 38.

The square root of 191186057 is about 13827.0046286244. The cubic root of 191186057 is about 576.0834588831.

The spelling of 191186057 in words is "one hundred ninety-one million, one hundred eighty-six thousand, fifty-seven".