158190909 has 4 divisors (see below), whose sum is σ = 210921216. Its totient is φ = 105460604.

The previous prime is 158190887. The next prime is 158190959. The reversal of 158190909 is 909091851.

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, and also an emirpimes, since its reverse is a distinct semiprime: 909091851 = 3 ⋅303030617.

It is a cyclic number.

It is not a de Polignac number, because 158190909 - 2⁹ = 158190397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158190959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26365149 + ... + 26365154.

It is an arithmetic number, because the mean of its divisors is an integer number (52730304).

Almost surely, 2^158190909 is an apocalyptic number.

It is an amenable number.

158190909 is a deficient number, since it is larger than the sum of its proper divisors (52730307).

158190909 is an equidigital number, since it uses as much as digits as its factorization.

158190909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52730306.

The product of its (nonzero) digits is 29160, while the sum is 42.

The square root of 158190909 is about 12577.3967497253. The cubic root of 158190909 is about 540.8296677004.

The spelling of 158190909 in words is "one hundred fifty-eight million, one hundred ninety thousand, nine hundred nine".