159910991 has 2 divisors, whose sum is σ = 159910992. Its totient is φ = 159910990.

The previous prime is 159910981. The next prime is 159911009. The reversal of 159910991 is 199019951.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-159910991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (159910981) 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, 79955495 + 79955496.

It is an arithmetic number, because the mean of its divisors is an integer number (79955496).

Almost surely, 2^159910991 is an apocalyptic number.

159910991 is a deficient number, since it is larger than the sum of its proper divisors (1).

159910991 is an equidigital number, since it uses as much as digits as its factorization.

159910991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32805, while the sum is 44.

The square root of 159910991 is about 12645.5917615586. The cubic root of 159910991 is about 542.7828348131.

The spelling of 159910991 in words is "one hundred fifty-nine million, nine hundred ten thousand, nine hundred ninety-one".