158909 has 2 divisors, whose sum is σ = 158910. Its totient is φ = 158908.

The previous prime is 158881. The next prime is 158923. The reversal of 158909 is 909851.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103684 + 55225 = 322^2 + 235^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-158909 is a prime.

It is a Chen prime.

It is a nialpdrome in base 11.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (158959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79454 + 79455.

It is an arithmetic number, because the mean of its divisors is an integer number (79455).

2¹⁵⁸⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

158909 is a deficient number, since it is larger than the sum of its proper divisors (1).

158909 is an equidigital number, since it uses as much as digits as its factorization.

158909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 32.

The square root of 158909 is about 398.6339172725. The cubic root of 158909 is about 54.1646779020.

The spelling of 158909 in words is "one hundred fifty-eight thousand, nine hundred nine".