1181998793 has 2 divisors, whose sum is σ = 1181998794. Its totient is φ = 1181998792.

The previous prime is 1181998787. The next prime is 1181998801. The reversal of 1181998793 is 3978991811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1095080464 + 86918329 = 33092^2 + 9323^2 .

It is an emirp because it is prime and its reverse (3978991811) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1181998793 - 2⁸ = 1181998537 is a prime.

It is a super-2 number, since 2×1181998793² = 2794242293306913698, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1181998703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 590999396 + 590999397.

It is an arithmetic number, because the mean of its divisors is an integer number (590999397).

Almost surely, 2^1181998793 is an apocalyptic number.

It is an amenable number.

1181998793 is a deficient number, since it is larger than the sum of its proper divisors (1).

1181998793 is an equidigital number, since it uses as much as digits as its factorization.

1181998793 is an evil number, because the sum of its binary digits is even.

The product of its digits is 979776, while the sum is 56.

The square root of 1181998793 is about 34380.2093216432. The cubic root of 1181998793 is about 1057.3181263528.

The spelling of 1181998793 in words is "one billion, one hundred eighty-one million, nine hundred ninety-eight thousand, seven hundred ninety-three".