158918209 has 4 divisors (see below), whose sum is σ = 159212500. Its totient is φ = 158623920.

The previous prime is 158918203. The next prime is 158918213. The reversal of 158918209 is 902819851.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 28387584 + 130530625 = 5328^2 + 11425^2 .

It is a cyclic number.

It is not a de Polignac number, because 158918209 - 2⁹ = 158917697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (158918203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146334 + ... + 147415.

It is an arithmetic number, because the mean of its divisors is an integer number (39803125).

Almost surely, 2^158918209 is an apocalyptic number.

It is an amenable number.

158918209 is a deficient number, since it is larger than the sum of its proper divisors (294291).

158918209 is an equidigital number, since it uses as much as digits as its factorization.

158918209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294290.

The product of its (nonzero) digits is 51840, while the sum is 43.

The square root of 158918209 is about 12606.2765716130. The cubic root of 158918209 is about 541.6572418820.

The spelling of 158918209 in words is "one hundred fifty-eight million, nine hundred eighteen thousand, two hundred nine".