159792981 has 4 divisors (see below), whose sum is σ = 213057312. Its totient is φ = 106528652.

The previous prime is 159792959. The next prime is 159792991. The reversal of 159792981 is 189297951.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 159792981 - 2⁶ = 159792917 is a prime.

It is a super-2 number, since 2×159792981² = 51067593553732722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (159792991) 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, 26632161 + ... + 26632166.

It is an arithmetic number, because the mean of its divisors is an integer number (53264328).

Almost surely, 2^159792981 is an apocalyptic number.

It is an amenable number.

159792981 is a deficient number, since it is larger than the sum of its proper divisors (53264331).

159792981 is an equidigital number, since it uses as much as digits as its factorization.

159792981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53264330.

The product of its digits is 408240, while the sum is 51.

The square root of 159792981 is about 12640.9248474943. The cubic root of 159792981 is about 542.6492822556.

The spelling of 159792981 in words is "one hundred fifty-nine million, seven hundred ninety-two thousand, nine hundred eighty-one".