158144989 has 4 divisors (see below), whose sum is σ = 161509824. Its totient is φ = 154780156.

The previous prime is 158144953. The next prime is 158145007. The reversal of 158144989 is 989441851.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 158144989 - 2²⁷ = 23927261 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158144929) 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, 1682347 + ... + 1682440.

It is an arithmetic number, because the mean of its divisors is an integer number (40377456).

Almost surely, 2^158144989 is an apocalyptic number.

It is an amenable number.

158144989 is a deficient number, since it is larger than the sum of its proper divisors (3364835).

158144989 is an equidigital number, since it uses as much as digits as its factorization.

158144989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3364834.

The product of its digits is 414720, while the sum is 49.

The square root of 158144989 is about 12575.5711202315. The cubic root of 158144989 is about 540.7773315666. Note that the first 3 decimals are identical.

The spelling of 158144989 in words is "one hundred fifty-eight million, one hundred forty-four thousand, nine hundred eighty-nine".