1111997279 has 2 divisors, whose sum is σ = 1111997280. Its totient is φ = 1111997278.

The previous prime is 1111997267. The next prime is 1111997303. The reversal of 1111997279 is 9727991111.

It is a weak prime.

It is an emirp because it is prime and its reverse (9727991111) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1111997279 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1111997209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555998639 + 555998640.

It is an arithmetic number, because the mean of its divisors is an integer number (555998640).

Almost surely, 2^1111997279 is an apocalyptic number.

1111997279 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111997279 is an equidigital number, since it uses as much as digits as its factorization.

1111997279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 71442, while the sum is 47.

The square root of 1111997279 is about 33346.6232023574. The cubic root of 1111997279 is about 1036.0194484480.

The spelling of 1111997279 in words is "one billion, one hundred eleven million, nine hundred ninety-seven thousand, two hundred seventy-nine".