159447991 has 8 divisors (see below), whose sum is σ = 161697600. Its totient is φ = 157204320.

The previous prime is 159447989. The next prime is 159448013. The reversal of 159447991 is 199744951.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 159447991 - 2¹ = 159447989 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 (159447901) 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, 92445 + ... + 94153.

It is an arithmetic number, because the mean of its divisors is an integer number (20212200).

Almost surely, 2^159447991 is an apocalyptic number.

159447991 is a deficient number, since it is larger than the sum of its proper divisors (2249609).

159447991 is a wasteful number, since it uses less digits than its factorization.

159447991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2969.

The product of its digits is 408240, while the sum is 49.

The square root of 159447991 is about 12627.2717164081. The cubic root of 159447991 is about 542.2584777219.

The spelling of 159447991 in words is "one hundred fifty-nine million, four hundred forty-seven thousand, nine hundred ninety-one".