159040991 has 2 divisors, whose sum is σ = 159040992. Its totient is φ = 159040990.

The previous prime is 159040951. The next prime is 159040993. The reversal of 159040991 is 199040951.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 159040991 - 2¹⁰ = 159039967 is a prime.

Together with 159040993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (159040993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79520495 + 79520496.

It is an arithmetic number, because the mean of its divisors is an integer number (79520496).

Almost surely, 2^159040991 is an apocalyptic number.

159040991 is a deficient number, since it is larger than the sum of its proper divisors (1).

159040991 is an equidigital number, since it uses as much as digits as its factorization.

159040991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14580, while the sum is 38.

The square root of 159040991 is about 12611.1455070505. The cubic root of 159040991 is about 541.7967028025.

The spelling of 159040991 in words is "one hundred fifty-nine million, forty thousand, nine hundred ninety-one".