158965 has 4 divisors (see below), whose sum is σ = 190764. Its totient is φ = 127168.

The previous prime is 158959. The next prime is 158981. The reversal of 158965 is 569851.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 88209 + 70756 = 297^2 + 266^2 .

It is a cyclic number.

It is not a de Polignac number, because 158965 - 2¹⁷ = 27893 is a prime.

It is a Duffinian number.

158965 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 158965.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15892 + ... + 15901.

It is an arithmetic number, because the mean of its divisors is an integer number (47691).

2¹⁵⁸⁹⁶⁵ is an apocalyptic number.

It is an amenable number.

158965 is a deficient number, since it is larger than the sum of its proper divisors (31799).

158965 is an equidigital number, since it uses as much as digits as its factorization.

158965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31798.

The product of its digits is 10800, while the sum is 34.

The square root of 158965 is about 398.7041509691. The cubic root of 158965 is about 54.1710397521.

It can be divided in two parts, 1589 and 65, that multiplied together give a triangular number (103285 = T₄₅₄).

The spelling of 158965 in words is "one hundred fifty-eight thousand, nine hundred sixty-five".