158139173 has 4 divisors (see below), whose sum is σ = 161996268. Its totient is φ = 154282080.

The previous prime is 158139167. The next prime is 158139193. The reversal of 158139173 is 371931851.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 51595489 + 106543684 = 7183^2 + 10322^2 .

It is a cyclic number.

It is not a de Polignac number, because 158139173 - 2¹⁶ = 158073637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158139103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1928486 + ... + 1928567.

It is an arithmetic number, because the mean of its divisors is an integer number (40499067).

Almost surely, 2^158139173 is an apocalyptic number.

It is an amenable number.

158139173 is a deficient number, since it is larger than the sum of its proper divisors (3857095).

158139173 is an equidigital number, since it uses as much as digits as its factorization.

158139173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3857094.

The product of its digits is 22680, while the sum is 38.

The square root of 158139173 is about 12575.3398761226. The cubic root of 158139173 is about 540.7707022080.

The spelling of 158139173 in words is "one hundred fifty-eight million, one hundred thirty-nine thousand, one hundred seventy-three".