158623921 has 8 divisors (see below), whose sum is σ = 163303784. Its totient is φ = 153964800.

The previous prime is 158623909. The next prime is 158623961. The reversal of 158623921 is 129326851.

It can be written as a sum of positive squares in 4 ways, for example, as 64320400 + 94303521 = 8020^2 + 9711^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 158623921 - 2¹¹ = 158621873 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a deceptive number, since it divides R_158623920.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a 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 in 7 ways as a sum of consecutive naturals, for example, 11071 + ... + 20971.

It is an arithmetic number, because the mean of its divisors is an integer number (20412973).

Almost surely, 2^158623921 is an apocalyptic number.

It is an amenable number.

158623921 is a deficient number, since it is larger than the sum of its proper divisors (4679863).

158623921 is an equidigital number, since it uses as much as digits as its factorization.

158623921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10371.

The product of its digits is 25920, while the sum is 37.

The square root of 158623921 is about 12594.5988820605. The cubic root of 158623921 is about 541.3226846190.

The spelling of 158623921 in words is "one hundred fifty-eight million, six hundred twenty-three thousand, nine hundred twenty-one".