1158961 has 2 divisors, whose sum is σ = 1158962. Its totient is φ = 1158960.

The previous prime is 1158953. The next prime is 1158977. The reversal of 1158961 is 1698511.

It is the 440-th star number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 913936 + 245025 = 956^2 + 495^2 .

It is an emirp because it is prime and its reverse (1698511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1158961 - 2³ = 1158953 is a prime.

It is not a weakly prime, because it can be changed into another prime (1158991) 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 as a sum of consecutive naturals, namely, 579480 + 579481.

It is an arithmetic number, because the mean of its divisors is an integer number (579481).

2^1158961 is an apocalyptic number.

It is an amenable number.

1158961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1158961 is an equidigital number, since it uses as much as digits as its factorization.

1158961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 31.

The square root of 1158961 is about 1076.5505097300. The cubic root of 1158961 is about 105.0403775170.

The spelling of 1158961 in words is "one million, one hundred fifty-eight thousand, nine hundred sixty-one".