158491589 has 4 divisors (see below), whose sum is σ = 158734956. Its totient is φ = 158248224.

The previous prime is 158491579. The next prime is 158491591. The reversal of 158491589 is 985194851.

158491589 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 985194851 = 257 ⋅3833443.

It can be written as a sum of positive squares in 2 ways, for example, as 15880225 + 142611364 = 3985^2 + 11942^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-158491589 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158491579) 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, 120704 + ... + 122009.

It is an arithmetic number, because the mean of its divisors is an integer number (39683739).

Almost surely, 2^158491589 is an apocalyptic number.

It is an amenable number.

158491589 is a deficient number, since it is larger than the sum of its proper divisors (243367).

158491589 is an equidigital number, since it uses as much as digits as its factorization.

158491589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243366.

The product of its digits is 518400, while the sum is 50.

The square root of 158491589 is about 12589.3442640989. The cubic root of 158491589 is about 541.1721099293.

The spelling of 158491589 in words is "one hundred fifty-eight million, four hundred ninety-one thousand, five hundred eighty-nine".