1158216797 has 2 divisors, whose sum is σ = 1158216798. Its totient is φ = 1158216796.

The previous prime is 1158216779. The next prime is 1158216803. The reversal of 1158216797 is 7976128511.

Together with previous prime (1158216779) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1143386596 + 14830201 = 33814^2 + 3851^2 .

It is a cyclic number.

It is not a de Polignac number, because 1158216797 - 2⁶ = 1158216733 is a prime.

It is a super-2 number, since 2×1158216797² = 2682932297705878418, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1158216737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 579108398 + 579108399.

It is an arithmetic number, because the mean of its divisors is an integer number (579108399).

Almost surely, 2^1158216797 is an apocalyptic number.

It is an amenable number.

1158216797 is a deficient number, since it is larger than the sum of its proper divisors (1).

1158216797 is an equidigital number, since it uses as much as digits as its factorization.

1158216797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 211680, while the sum is 47.

The square root of 1158216797 is about 34032.5843420684. The cubic root of 1158216797 is about 1050.1788952935.

The spelling of 1158216797 in words is "one billion, one hundred fifty-eight million, two hundred sixteen thousand, seven hundred ninety-seven".