158561 has 4 divisors (see below), whose sum is σ = 170772. Its totient is φ = 146352.

The previous prime is 158551. The next prime is 158563. The reversal of 158561 is 165851.

158561 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.

It can be written as a sum of positive squares in 2 ways, for example, as 65536 + 93025 = 256^2 + 305^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-158561 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a zygodrome in base 3.

It is a self number, because there is not a number n which added to its sum of digits gives 158561.

It is not an unprimeable number, because it can be changed into a prime (158563) 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, 6086 + ... + 6111.

It is an arithmetic number, because the mean of its divisors is an integer number (42693).

2¹⁵⁸⁵⁶¹ is an apocalyptic number.

It is an amenable number.

158561 is a deficient number, since it is larger than the sum of its proper divisors (12211).

158561 is a wasteful number, since it uses less digits than its factorization.

158561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12210.

The product of its digits is 1200, while the sum is 26.

The square root of 158561 is about 398.1971873331. The cubic root of 158561 is about 54.1251100062.

The spelling of 158561 in words is "one hundred fifty-eight thousand, five hundred sixty-one".