191930131 has 2 divisors, whose sum is σ = 191930132. Its totient is φ = 191930130.

The previous prime is 191930069. The next prime is 191930171. The reversal of 191930131 is 131039191.

It is a strong prime.

It is an emirp because it is prime and its reverse (131039191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 191930131 - 2¹¹ = 191928083 is a prime.

It is a super-2 number, since 2×191930131² = 73674350371354322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 191930131.

It is not a weakly prime, because it can be changed into another prime (191930171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95965065 + 95965066.

It is an arithmetic number, because the mean of its divisors is an integer number (95965066).

Almost surely, 2^191930131 is an apocalyptic number.

191930131 is a deficient number, since it is larger than the sum of its proper divisors (1).

191930131 is an equidigital number, since it uses as much as digits as its factorization.

191930131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 729, while the sum is 28.

The square root of 191930131 is about 13853.8850507719. The cubic root of 191930131 is about 576.8298414834.

The spelling of 191930131 in words is "one hundred ninety-one million, nine hundred thirty thousand, one hundred thirty-one".