158997 has 4 divisors (see below), whose sum is σ = 212000. Its totient is φ = 105996.

The previous prime is 158993. The next prime is 159013. The reversal of 158997 is 799851.

It is a happy number.

158997 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 a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 158997 - 2² = 158993 is a prime.

It is a D-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 (158993) 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, 26497 + ... + 26502.

It is an arithmetic number, because the mean of its divisors is an integer number (53000).

2¹⁵⁸⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

158997 is a deficient number, since it is larger than the sum of its proper divisors (53003).

158997 is an equidigital number, since it uses as much as digits as its factorization.

158997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53002.

The product of its digits is 22680, while the sum is 39.

The square root of 158997 is about 398.7442789558. The cubic root of 158997 is about 54.1746744243.

The spelling of 158997 in words is "one hundred fifty-eight thousand, nine hundred ninety-seven".