158161509 has 24 divisors (see below), whose sum is σ = 250192800. Its totient is φ = 95483040.

The previous prime is 158161483. The next prime is 158161513. The reversal of 158161509 is 905161851.

158161509 is a `hidden beast` number, since 15 + 81 + 61 + 509 = 666.

It is not a de Polignac number, because 158161509 - 2¹⁷ = 158030437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158161579) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23662 + ... + 29600.

It is an arithmetic number, because the mean of its divisors is an integer number (10424700).

Almost surely, 2^158161509 is an apocalyptic number.

It is an amenable number.

158161509 is a deficient number, since it is larger than the sum of its proper divisors (92031291).

158161509 is a wasteful number, since it uses less digits than its factorization.

158161509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6225 (or 6222 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 36.

The square root of 158161509 is about 12576.2279320947. The cubic root of 158161509 is about 540.7961609765.

The spelling of 158161509 in words is "one hundred fifty-eight million, one hundred sixty-one thousand, five hundred nine".