191957137 has 2 divisors, whose sum is σ = 191957138. Its totient is φ = 191957136.

The previous prime is 191957111. The next prime is 191957153. The reversal of 191957137 is 731759191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 187799616 + 4157521 = 13704^2 + 2039^2 .

It is a cyclic number.

It is not a de Polignac number, because 191957137 - 2⁷ = 191957009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 191957093 and 191957102.

It is not a weakly prime, because it can be changed into another prime (191957537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95978568 + 95978569.

It is an arithmetic number, because the mean of its divisors is an integer number (95978569).

Almost surely, 2^191957137 is an apocalyptic number.

It is an amenable number.

191957137 is a deficient number, since it is larger than the sum of its proper divisors (1).

191957137 is an equidigital number, since it uses as much as digits as its factorization.

191957137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 59535, while the sum is 43.

The square root of 191957137 is about 13854.8596889323. The cubic root of 191957137 is about 576.8568949673.

The spelling of 191957137 in words is "one hundred ninety-one million, nine hundred fifty-seven thousand, one hundred thirty-seven".