158909817 has 16 divisors (see below), whose sum is σ = 231356160. Its totient is φ = 96219600.

The previous prime is 158909771. The next prime is 158909827. The reversal of 158909817 is 718909851.

It is not a de Polignac number, because 158909817 - 2¹⁹ = 158385529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (158909827) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58434 + ... + 61092.

It is an arithmetic number, because the mean of its divisors is an integer number (14459760).

Almost surely, 2^158909817 is an apocalyptic number.

It is an amenable number.

158909817 is a deficient number, since it is larger than the sum of its proper divisors (72446343).

158909817 is a wasteful number, since it uses less digits than its factorization.

158909817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4484.

The product of its (nonzero) digits is 181440, while the sum is 48.

The square root of 158909817 is about 12605.9437171518. The cubic root of 158909817 is about 541.6477072759.

The spelling of 158909817 in words is "one hundred fifty-eight million, nine hundred nine thousand, eight hundred seventeen".