2689818997 has 2 divisors, whose sum is σ = 2689818998. Its totient is φ = 2689818996.

The previous prime is 2689818959. The next prime is 2689819001. The reversal of 2689818997 is 7998189862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1904362321 + 785456676 = 43639^2 + 28026^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2689818997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2689818907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1344909498 + 1344909499.

It is an arithmetic number, because the mean of its divisors is an integer number (1344909499).

Almost surely, 2^2689818997 is an apocalyptic number.

It is an amenable number.

2689818997 is a deficient number, since it is larger than the sum of its proper divisors (1).

2689818997 is an equidigital number, since it uses as much as digits as its factorization.

2689818997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31352832, while the sum is 67.

The square root of 2689818997 is about 51863.4649536646. The cubic root of 2689818997 is about 1390.7242222563.

The spelling of 2689818997 in words is "two billion, six hundred eighty-nine million, eight hundred eighteen thousand, nine hundred ninety-seven".