158121 has 6 divisors (see below), whose sum is σ = 228410. Its totient is φ = 105408.

The previous prime is 158113. The next prime is 158129. The reversal of 158121 is 121851.

158121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (158113) and next prime (158129).

It can be written as a sum of positive squares in only one way, i.e., 90000 + 68121 = 300^2 + 261^2 .

It is not a de Polignac number, because 158121 - 2³ = 158113 is a prime.

It is a Duffinian number.

It is a Curzon number.

158121 is a lucky number.

It is a nialpdrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 158094 and 158103.

It is not an unprimeable number, because it can be changed into a prime (158129) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8776 + ... + 8793.

2¹⁵⁸¹²¹ is an apocalyptic number.

It is an amenable number.

158121 is a deficient number, since it is larger than the sum of its proper divisors (70289).

158121 is a wasteful number, since it uses less digits than its factorization.

158121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17575 (or 17572 counting only the distinct ones).

The product of its digits is 80, while the sum is 18.

The square root of 158121 is about 397.6443134260. The cubic root of 158121 is about 54.0749986695.

Adding to 158121 its reverse (121851), we get a palindrome (279972).

The spelling of 158121 in words is "one hundred fifty-eight thousand, one hundred twenty-one".