1158971521 has 2 divisors, whose sum is σ = 1158971522. Its totient is φ = 1158971520.

The previous prime is 1158971503. The next prime is 1158971531. The reversal of 1158971521 is 1251798511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1018311921 + 140659600 = 31911^2 + 11860^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1158971521 is a prime.

It is not a weakly prime, because it can be changed into another prime (1158971501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 579485760 + 579485761.

It is an arithmetic number, because the mean of its divisors is an integer number (579485761).

Almost surely, 2^1158971521 is an apocalyptic number.

It is an amenable number.

1158971521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1158971521 is an equidigital number, since it uses as much as digits as its factorization.

1158971521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25200, while the sum is 40.

The square root of 1158971521 is about 34043.6707920870. The cubic root of 1158971521 is about 1050.4069536680.

The spelling of 1158971521 in words is "one billion, one hundred fifty-eight million, nine hundred seventy-one thousand, five hundred twenty-one".