191881912337 has 2 divisors, whose sum is σ = 191881912338. Its totient is φ = 191881912336.

The previous prime is 191881912319. The next prime is 191881912367. The reversal of 191881912337 is 733219188191.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 185034184336 + 6847728001 = 430156^2 + 82751^2 .

It is a cyclic number.

It is not a de Polignac number, because 191881912337 - 2¹⁶ = 191881846801 is a prime.

It is not a weakly prime, because it can be changed into another prime (191881912307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95940956168 + 95940956169.

It is an arithmetic number, because the mean of its divisors is an integer number (95940956169).

Almost surely, 2^191881912337 is an apocalyptic number.

It is an amenable number.

191881912337 is a deficient number, since it is larger than the sum of its proper divisors (1).

191881912337 is an equidigital number, since it uses as much as digits as its factorization.

191881912337 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 53.

The spelling of 191881912337 in words is "one hundred ninety-one billion, eight hundred eighty-one million, nine hundred twelve thousand, three hundred thirty-seven".