181930033091 has 2 divisors, whose sum is σ = 181930033092. Its totient is φ = 181930033090.

The previous prime is 181930033079. The next prime is 181930033171. The reversal of 181930033091 is 190330039181.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-181930033091 is a prime.

It is not a weakly prime, because it can be changed into another prime (181930033031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90965016545 + 90965016546.

It is an arithmetic number, because the mean of its divisors is an integer number (90965016546).

Almost surely, 2^181930033091 is an apocalyptic number.

181930033091 is a deficient number, since it is larger than the sum of its proper divisors (1).

181930033091 is an equidigital number, since it uses as much as digits as its factorization.

181930033091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 38.

The spelling of 181930033091 in words is "one hundred eighty-one billion, nine hundred thirty million, thirty-three thousand, ninety-one".