159151381 has 4 divisors (see below), whose sum is σ = 163033164. Its totient is φ = 155269600.

The previous prime is 159151361. The next prime is 159151397. The reversal of 159151381 is 183151951.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 183151951 = 61 ⋅3002491.

It can be written as a sum of positive squares in 2 ways, for example, as 94750756 + 64400625 = 9734^2 + 8025^2 .

It is a cyclic number.

It is not a de Polignac number, because 159151381 - 2⁷ = 159151253 is a prime.

It is a super-2 number, since 2×159151381² = 50658324148414322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (159151301) 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, 1940830 + ... + 1940911.

It is an arithmetic number, because the mean of its divisors is an integer number (40758291).

Almost surely, 2^159151381 is an apocalyptic number.

It is an amenable number.

159151381 is a deficient number, since it is larger than the sum of its proper divisors (3881783).

159151381 is an equidigital number, since it uses as much as digits as its factorization.

159151381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3881782.

The product of its digits is 5400, while the sum is 34.

The square root of 159151381 is about 12615.5214319504. The cubic root of 159151381 is about 541.9220271088.

The spelling of 159151381 in words is "one hundred fifty-nine million, one hundred fifty-one thousand, three hundred eighty-one".