7111998917 has 2 divisors, whose sum is σ = 7111998918. Its totient is φ = 7111998916.

The previous prime is 7111998877. The next prime is 7111998983. The reversal of 7111998917 is 7198991117.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4711586881 + 2400412036 = 68641^2 + 48994^2 .

It is a cyclic number.

It is not a de Polignac number, because 7111998917 - 2¹² = 7111994821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7111998017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3555999458 + 3555999459.

It is an arithmetic number, because the mean of its divisors is an integer number (3555999459).

Almost surely, 2^7111998917 is an apocalyptic number.

It is an amenable number.

7111998917 is a deficient number, since it is larger than the sum of its proper divisors (1).

7111998917 is an equidigital number, since it uses as much as digits as its factorization.

7111998917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 285768, while the sum is 53.

The square root of 7111998917 is about 84332.6681482330. The cubic root of 7111998917 is about 1923.0794511002.

The spelling of 7111998917 in words is "seven billion, one hundred eleven million, nine hundred ninety-eight thousand, nine hundred seventeen".