158557 has 4 divisors (see below), whose sum is σ = 181216. Its totient is φ = 135900.

The previous prime is 158551. The next prime is 158563. The reversal of 158557 is 755851.

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, and also an emirpimes, since its reverse is a distinct semiprime: 755851 = 61 ⋅12391.

It is an interprime number because it is at equal distance from previous prime (158551) and next prime (158563).

It is a cyclic number.

It is not a de Polignac number, because 158557 - 2⁷ = 158429 is a prime.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158551) 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, 11319 + ... + 11332.

It is an arithmetic number, because the mean of its divisors is an integer number (45304).

2¹⁵⁸⁵⁵⁷ is an apocalyptic number.

It is an amenable number.

158557 is a deficient number, since it is larger than the sum of its proper divisors (22659).

158557 is an equidigital number, since it uses as much as digits as its factorization.

158557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22658.

The product of its digits is 7000, while the sum is 31.

The square root of 158557 is about 398.1921646642. The cubic root of 158557 is about 54.1246548664.

The spelling of 158557 in words is "one hundred fifty-eight thousand, five hundred fifty-seven".