191936281 has 2 divisors, whose sum is σ = 191936282. Its totient is φ = 191936280.

The previous prime is 191936257. The next prime is 191936299. The reversal of 191936281 is 182639191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99680256 + 92256025 = 9984^2 + 9605^2 .

It is a cyclic number.

It is not a de Polignac number, because 191936281 - 2⁷ = 191936153 is a prime.

It is a super-2 number, since 2×191936281² = 73679071928221922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (191936231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95968140 + 95968141.

It is an arithmetic number, because the mean of its divisors is an integer number (95968141).

Almost surely, 2^191936281 is an apocalyptic number.

It is an amenable number.

191936281 is a deficient number, since it is larger than the sum of its proper divisors (1).

191936281 is an equidigital number, since it uses as much as digits as its factorization.

191936281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 40.

The square root of 191936281 is about 13854.1070083929. The cubic root of 191936281 is about 576.8360025199.

The spelling of 191936281 in words is "one hundred ninety-one million, nine hundred thirty-six thousand, two hundred eighty-one".