159813 has 10 divisors (see below), whose sum is σ = 238854. Its totient is φ = 106488.

The previous prime is 159811. The next prime is 159833. The reversal of 159813 is 318951.

It can be written as a sum of positive squares in only one way, i.e., 116964 + 42849 = 342^2 + 207^2 .

It is not a de Polignac number, because 159813 - 2¹ = 159811 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (159811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 906 + ... + 1067.

2¹⁵⁹⁸¹³ is an apocalyptic number.

It is an amenable number.

159813 is a deficient number, since it is larger than the sum of its proper divisors (79041).

159813 is an equidigital number, since it uses as much as digits as its factorization.

159813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1985 (or 1976 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

The square root of 159813 is about 399.7661816612. The cubic root of 159813 is about 54.2671942497.

The spelling of 159813 in words is "one hundred fifty-nine thousand, eight hundred thirteen".