158917409 has 4 divisors (see below), whose sum is σ = 181619904. Its totient is φ = 136214916.

The previous prime is 158917391. The next prime is 158917469. The reversal of 158917409 is 904719851.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 158917409 - 2¹⁶ = 158851873 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 158917409.

It is not an unprimeable number, because it can be changed into a prime (158917469) 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, 11351237 + ... + 11351250.

It is an arithmetic number, because the mean of its divisors is an integer number (45404976).

Almost surely, 2^158917409 is an apocalyptic number.

It is an amenable number.

158917409 is a deficient number, since it is larger than the sum of its proper divisors (22702495).

158917409 is an equidigital number, since it uses as much as digits as its factorization.

158917409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22702494.

The product of its (nonzero) digits is 90720, while the sum is 44.

The square root of 158917409 is about 12606.2448413475. The cubic root of 158917409 is about 541.6563329731.

The spelling of 158917409 in words is "one hundred fifty-eight million, nine hundred seventeen thousand, four hundred nine".