158432191 has 4 divisors (see below), whose sum is σ = 163895400. Its totient is φ = 152968984.

The previous prime is 158432177. The next prime is 158432201. The reversal of 158432191 is 191234851.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 191234851 = 1109 ⋅172439.

It is a cyclic number.

It is not a de Polignac number, because 158432191 - 2¹⁷ = 158301119 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 (158432101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2731561 + ... + 2731618.

It is an arithmetic number, because the mean of its divisors is an integer number (40973850).

Almost surely, 2^158432191 is an apocalyptic number.

158432191 is a deficient number, since it is larger than the sum of its proper divisors (5463209).

158432191 is an equidigital number, since it uses as much as digits as its factorization.

158432191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5463208.

The product of its digits is 8640, while the sum is 34.

The square root of 158432191 is about 12586.9849844989. The cubic root of 158432191 is about 541.1044963362.

The spelling of 158432191 in words is "one hundred fifty-eight million, four hundred thirty-two thousand, one hundred ninety-one".