158645 has 4 divisors (see below), whose sum is σ = 190380. Its totient is φ = 126912.

The previous prime is 158633. The next prime is 158647. The reversal of 158645 is 546851.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 546851 = 233 ⋅2347.

It can be written as a sum of positive squares in 2 ways, for example, as 111556 + 47089 = 334^2 + 217^2 .

It is a cyclic number.

It is not a de Polignac number, because 158645 - 2⁶ = 158581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158647) by changing a digit.

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, 15860 + ... + 15869.

It is an arithmetic number, because the mean of its divisors is an integer number (47595).

2¹⁵⁸⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

158645 is a deficient number, since it is larger than the sum of its proper divisors (31735).

158645 is an equidigital number, since it uses as much as digits as its factorization.

158645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31734.

The product of its digits is 4800, while the sum is 29.

The square root of 158645 is about 398.3026487484. The cubic root of 158645 is about 54.1346661741.

The spelling of 158645 in words is "one hundred fifty-eight thousand, six hundred forty-five".