159691121 has 4 divisors (see below), whose sum is σ = 163404912. Its totient is φ = 155977332.

The previous prime is 159691073. The next prime is 159691151. The reversal of 159691121 is 121196951.

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 159691121 - 2¹⁴ = 159674737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (159691151) 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, 1856831 + ... + 1856916.

It is an arithmetic number, because the mean of its divisors is an integer number (40851228).

Almost surely, 2^159691121 is an apocalyptic number.

It is an amenable number.

159691121 is a deficient number, since it is larger than the sum of its proper divisors (3713791).

159691121 is an equidigital number, since it uses as much as digits as its factorization.

159691121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3713790.

The product of its digits is 4860, while the sum is 35.

The square root of 159691121 is about 12636.8952278635. The cubic root of 159691121 is about 542.5339538589.

The spelling of 159691121 in words is "one hundred fifty-nine million, six hundred ninety-one thousand, one hundred twenty-one".