158157187 has 4 divisors (see below), whose sum is σ = 158195520. Its totient is φ = 158118856.

The previous prime is 158157179. The next prime is 158157191. The reversal of 158157187 is 781751851.

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

It is a cyclic number.

It is not a de Polignac number, because 158157187 - 2³ = 158157179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (158157127) 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, 12112 + ... + 21517.

It is an arithmetic number, because the mean of its divisors is an integer number (39548880).

Almost surely, 2^158157187 is an apocalyptic number.

158157187 is a deficient number, since it is larger than the sum of its proper divisors (38333).

158157187 is an equidigital number, since it uses as much as digits as its factorization.

158157187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38332.

The product of its digits is 78400, while the sum is 43.

The square root of 158157187 is about 12576.0560987935. The cubic root of 158157187 is about 540.7912349100.

The spelling of 158157187 in words is "one hundred fifty-eight million, one hundred fifty-seven thousand, one hundred eighty-seven".