159415991 has 4 divisors (see below), whose sum is σ = 182189712. Its totient is φ = 136642272.

The previous prime is 159415979. The next prime is 159416003. The reversal of 159415991 is 199514951.

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

It is an interprime number because it is at equal distance from previous prime (159415979) and next prime (159416003).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-159415991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (159415951) 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, 11386850 + ... + 11386863.

It is an arithmetic number, because the mean of its divisors is an integer number (45547428).

Almost surely, 2^159415991 is an apocalyptic number.

159415991 is a deficient number, since it is larger than the sum of its proper divisors (22773721).

159415991 is an equidigital number, since it uses as much as digits as its factorization.

159415991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22773720.

The product of its digits is 72900, while the sum is 44.

The square root of 159415991 is about 12626.0045540939. The cubic root of 159415991 is about 542.2221995764. Note that the first 3 decimals are identical.

The spelling of 159415991 in words is "one hundred fifty-nine million, four hundred fifteen thousand, nine hundred ninety-one".