158623909 has 2 divisors, whose sum is σ = 158623910. Its totient is φ = 158623908.

The previous prime is 158623903. The next prime is 158623961. The reversal of 158623909 is 909326851.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 155002500 + 3621409 = 12450^2 + 1903^2 .

It is an emirp because it is prime and its reverse (909326851) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 158623909 - 2³ = 158623901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (158623901) 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 as a sum of consecutive naturals, namely, 79311954 + 79311955.

It is an arithmetic number, because the mean of its divisors is an integer number (79311955).

Almost surely, 2^158623909 is an apocalyptic number.

It is an amenable number.

158623909 is a deficient number, since it is larger than the sum of its proper divisors (1).

158623909 is an equidigital number, since it uses as much as digits as its factorization.

158623909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 116640, while the sum is 43.

The square root of 158623909 is about 12594.5984056658. The cubic root of 158623909 is about 541.3226709685.

The spelling of 158623909 in words is "one hundred fifty-eight million, six hundred twenty-three thousand, nine hundred nine".