1158121 has 2 divisors, whose sum is σ = 1158122. Its totient is φ = 1158120.

The previous prime is 1158089. The next prime is 1158133. The reversal of 1158121 is 1218511.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1125721 + 32400 = 1061^2 + 180^2 .

It is a cyclic number.

It is not a de Polignac number, because 1158121 - 2⁵ = 1158089 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1158161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 579060 + 579061.

It is an arithmetic number, because the mean of its divisors is an integer number (579061).

2^1158121 is an apocalyptic number.

It is an amenable number.

1158121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1158121 is an equidigital number, since it uses as much as digits as its factorization.

1158121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80, while the sum is 19.

The square root of 1158121 is about 1076.1603040440. The cubic root of 1158121 is about 105.0149940794.

The spelling of 1158121 in words is "one million, one hundred fifty-eight thousand, one hundred twenty-one".