159263991 has 12 divisors (see below), whose sum is σ = 230644440. Its totient is φ = 105900720.

The previous prime is 159263981. The next prime is 159263999. The reversal of 159263991 is 199362951.

It is a happy number.

159263991 is a `hidden beast` number, since 1 + 5 + 9 + 2 + 639 + 9 + 1 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-159263991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (159263999) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19245 + ... + 26246.

It is an arithmetic number, because the mean of its divisors is an integer number (19220370).

Almost surely, 2^159263991 is an apocalyptic number.

159263991 is a deficient number, since it is larger than the sum of its proper divisors (71380449).

159263991 is a wasteful number, since it uses less digits than its factorization.

159263991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45886 (or 45883 counting only the distinct ones).

The product of its digits is 131220, while the sum is 45.

The square root of 159263991 is about 12619.9837955522. The cubic root of 159263991 is about 542.0498120548.

The spelling of 159263991 in words is "one hundred fifty-nine million, two hundred sixty-three thousand, nine hundred ninety-one".