159990813 has 12 divisors (see below), whose sum is σ = 231433020. Its totient is φ = 106505856.

The previous prime is 159990799. The next prime is 159990821. The reversal of 159990813 is 318099951.

It can be written as a sum of positive squares in 2 ways, for example, as 40678884 + 119311929 = 6378^2 + 10923^2 .

It is not a de Polignac number, because 159990813 - 2⁴ = 159990797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (159990833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6156 + ... + 18917.

It is an arithmetic number, because the mean of its divisors is an integer number (19286085).

Almost surely, 2^159990813 is an apocalyptic number.

It is an amenable number.

159990813 is a deficient number, since it is larger than the sum of its proper divisors (71442207).

159990813 is a wasteful number, since it uses less digits than its factorization.

159990813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25788 (or 25785 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 45.

The square root of 159990813 is about 12648.7474873997. The cubic root of 159990813 is about 542.8731325557.

The spelling of 159990813 in words is "one hundred fifty-nine million, nine hundred ninety thousand, eight hundred thirteen".