159281491 has 4 divisors (see below), whose sum is σ = 159313392. Its totient is φ = 159249592.

The previous prime is 159281467. The next prime is 159281497. The reversal of 159281491 is 194182951.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 159281491 - 2¹⁷ = 159150419 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (159281497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6655 + ... + 19048.

It is an arithmetic number, because the mean of its divisors is an integer number (39828348).

Almost surely, 2^159281491 is an apocalyptic number.

159281491 is a deficient number, since it is larger than the sum of its proper divisors (31901).

159281491 is an equidigital number, since it uses as much as digits as its factorization.

159281491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31900.

The product of its digits is 25920, while the sum is 40.

The square root of 159281491 is about 12620.6771212958. The cubic root of 159281491 is about 542.0696648879.

The spelling of 159281491 in words is "one hundred fifty-nine million, two hundred eighty-one thousand, four hundred ninety-one".