159113781 has 8 divisors (see below), whose sum is σ = 235724160. Its totient is φ = 106075836.

The previous prime is 159113777. The next prime is 159113783. The reversal of 159113781 is 187311951.

It is not a de Polignac number, because 159113781 - 2² = 159113777 is a prime.

It is a super-2 number, since 2×159113781² = 50634390608231922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (159113783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2946525 + ... + 2946578.

It is an arithmetic number, because the mean of its divisors is an integer number (29465520).

Almost surely, 2^159113781 is an apocalyptic number.

It is an amenable number.

159113781 is a deficient number, since it is larger than the sum of its proper divisors (76610379).

159113781 is an equidigital number, since it uses as much as digits as its factorization.

159113781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5893112 (or 5893106 counting only the distinct ones).

The product of its digits is 7560, while the sum is 36.

The square root of 159113781 is about 12614.0311161817. The cubic root of 159113781 is about 541.8793468360.

The spelling of 159113781 in words is "one hundred fifty-nine million, one hundred thirteen thousand, seven hundred eighty-one".