1158179681 has 2 divisors, whose sum is σ = 1158179682. Its totient is φ = 1158179680.

The previous prime is 1158179653. The next prime is 1158179707. The reversal of 1158179681 is 1869718511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1087350625 + 70829056 = 32975^2 + 8416^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1158179681 is a prime.

It is a super-2 number, since 2×1158179681² = 2682760346962523522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1158179081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 579089840 + 579089841.

It is an arithmetic number, because the mean of its divisors is an integer number (579089841).

Almost surely, 2^1158179681 is an apocalyptic number.

It is an amenable number.

1158179681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1158179681 is an equidigital number, since it uses as much as digits as its factorization.

1158179681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 47.

The square root of 1158179681 is about 34032.0390367665. The cubic root of 1158179681 is about 1050.1676772278.

The spelling of 1158179681 in words is "one billion, one hundred fifty-eight million, one hundred seventy-nine thousand, six hundred eighty-one".