158508121 has 4 divisors (see below), whose sum is σ = 158558644. Its totient is φ = 158457600.

The previous prime is 158508109. The next prime is 158508143. The reversal of 158508121 is 121805851.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121805851 = 31 ⋅3929221.

It can be written as a sum of positive squares in 2 ways, for example, as 69488896 + 89019225 = 8336^2 + 9435^2 .

It is a cyclic number.

It is not a de Polignac number, because 158508121 - 2²⁷ = 24290393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (158508101) 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 3 ways as a sum of consecutive naturals, for example, 20220 + ... + 26941.

It is an arithmetic number, because the mean of its divisors is an integer number (39639661).

Almost surely, 2^158508121 is an apocalyptic number.

It is an amenable number.

158508121 is a deficient number, since it is larger than the sum of its proper divisors (50523).

158508121 is an equidigital number, since it uses as much as digits as its factorization.

158508121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50522.

The product of its (nonzero) digits is 3200, while the sum is 31.

The square root of 158508121 is about 12590.0008339952. Note that the first 3 decimals coincide. The cubic root of 158508121 is about 541.1909255361.

The spelling of 158508121 in words is "one hundred fifty-eight million, five hundred eight thousand, one hundred twenty-one".