158993 has 2 divisors, whose sum is σ = 158994. Its totient is φ = 158992.

The previous prime is 158981. The next prime is 159013. The reversal of 158993 is 399851.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 153664 + 5329 = 392^2 + 73^2 .

It is an emirp because it is prime and its reverse (399851) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 158993 - 2¹² = 154897 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (158923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79496 + 79497.

It is an arithmetic number, because the mean of its divisors is an integer number (79497).

2¹⁵⁸⁹⁹³ is an apocalyptic number.

It is an amenable number.

158993 is a deficient number, since it is larger than the sum of its proper divisors (1).

158993 is an equidigital number, since it uses as much as digits as its factorization.

158993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 35.

The square root of 158993 is about 398.7392631783. The cubic root of 158993 is about 54.1742201169.

The spelling of 158993 in words is "one hundred fifty-eight thousand, nine hundred ninety-three".