158941809 has 12 divisors (see below), whose sum is σ = 247242996. Its totient is φ = 97810272.

The previous prime is 158941793. The next prime is 158941813. The reversal of 158941809 is 908149851.

It can be written as a sum of positive squares in 2 ways, for example, as 69355584 + 89586225 = 8328^2 + 9465^2 .

It is not a de Polignac number, because 158941809 - 2⁴ = 158941793 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (158941819) 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 11 ways as a sum of consecutive naturals, for example, 679122 + ... + 679355.

It is an arithmetic number, because the mean of its divisors is an integer number (20603583).

Almost surely, 2^158941809 is an apocalyptic number.

It is an amenable number.

158941809 is a deficient number, since it is larger than the sum of its proper divisors (88301187).

158941809 is a wasteful number, since it uses less digits than its factorization.

158941809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1358496 (or 1358493 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 45.

The square root of 158941809 is about 12607.2125785203. The cubic root of 158941809 is about 541.6840533223.

The spelling of 158941809 in words is "one hundred fifty-eight million, nine hundred forty-one thousand, eight hundred nine".