159549381 has 6 divisors (see below), whose sum is σ = 230460230. Its totient is φ = 106366248.

The previous prime is 159549371. The next prime is 159549407. The reversal of 159549381 is 183945951.

159549381 is a `hidden beast` number, since 159 + 5 + 493 + 8 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 158986881 + 562500 = 12609^2 + 750^2 .

It is not a de Polignac number, because 159549381 - 2⁷ = 159549253 is a prime.

It is a super-2 number, since 2×159549381² = 50912009954966322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (159549331) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8863846 + ... + 8863863.

Almost surely, 2^159549381 is an apocalyptic number.

It is an amenable number.

159549381 is a deficient number, since it is larger than the sum of its proper divisors (70910849).

159549381 is a wasteful number, since it uses less digits than its factorization.

159549381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17727715 (or 17727712 counting only the distinct ones).

The product of its digits is 194400, while the sum is 45.

The square root of 159549381 is about 12631.2858015326. The cubic root of 159549381 is about 542.3733907150.

The spelling of 159549381 in words is "one hundred fifty-nine million, five hundred forty-nine thousand, three hundred eighty-one".