158109617 has 4 divisors (see below), whose sum is σ = 158508276. Its totient is φ = 157710960.

The previous prime is 158109607. The next prime is 158109619. The reversal of 158109617 is 716901851.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 716901851 = 41 ⋅17485411.

It can be written as a sum of positive squares in 2 ways, for example, as 142301041 + 15808576 = 11929^2 + 3976^2 .

It is a cyclic number.

It is not a de Polignac number, because 158109617 - 2⁸ = 158109361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (158109619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198734 + ... + 199527.

It is an arithmetic number, because the mean of its divisors is an integer number (39627069).

Almost surely, 2^158109617 is an apocalyptic number.

It is an amenable number.

158109617 is a deficient number, since it is larger than the sum of its proper divisors (398659).

158109617 is an equidigital number, since it uses as much as digits as its factorization.

158109617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398658.

The product of its (nonzero) digits is 15120, while the sum is 38.

The square root of 158109617 is about 12574.1646641039. The cubic root of 158109617 is about 540.7370103352.

The spelling of 158109617 in words is "one hundred fifty-eight million, one hundred nine thousand, six hundred seventeen".