159491643 has 8 divisors (see below), whose sum is σ = 223848000. Its totient is φ = 100731528.

The previous prime is 159491627. The next prime is 159491659. The reversal of 159491643 is 346194951.

It is an interprime number because it is at equal distance from previous prime (159491627) and next prime (159491659).

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

It is not a de Polignac number, because 159491643 - 2⁴ = 159491627 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 159491595 and 159491604.

It is not an unprimeable number, because it can be changed into a prime (159491623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1398993 + ... + 1399106.

It is an arithmetic number, because the mean of its divisors is an integer number (27981000).

Almost surely, 2^159491643 is an apocalyptic number.

159491643 is a deficient number, since it is larger than the sum of its proper divisors (64356357).

159491643 is a wasteful number, since it uses less digits than its factorization.

159491643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2798121.

The product of its digits is 116640, while the sum is 42.

The square root of 159491643 is about 12629.0000791828. Note that the first 4 decimals coincide. The cubic root of 159491643 is about 542.3079578212.

The spelling of 159491643 in words is "one hundred fifty-nine million, four hundred ninety-one thousand, six hundred forty-three".