158916209 has 4 divisors (see below), whose sum is σ = 167280240. Its totient is φ = 150552180.

The previous prime is 158916203. The next prime is 158916211. The reversal of 158916209 is 902619851.

It is a happy number.

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 158916209 - 2⁴ = 158916193 is a prime.

It is a super-2 number, since 2×158916209² = 50508722965863362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (158916203) 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, 4181987 + ... + 4182024.

It is an arithmetic number, because the mean of its divisors is an integer number (41820060).

Almost surely, 2^158916209 is an apocalyptic number.

158916209 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

158916209 is a deficient number, since it is larger than the sum of its proper divisors (8364031).

158916209 is an equidigital number, since it uses as much as digits as its factorization.

158916209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8364030.

The product of its (nonzero) digits is 38880, while the sum is 41.

The square root of 158916209 is about 12606.1972457994. The cubic root of 158916209 is about 541.6549696041.

The spelling of 158916209 in words is "one hundred fifty-eight million, nine hundred sixteen thousand, two hundred nine".