2691478817 has 2 divisors, whose sum is σ = 2691478818. Its totient is φ = 2691478816.

The previous prime is 2691478793. The next prime is 2691478831. The reversal of 2691478817 is 7188741962.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2173051456 + 518427361 = 46616^2 + 22769^2 .

It is a cyclic number.

It is not a de Polignac number, because 2691478817 - 2¹⁰ = 2691477793 is a prime.

It is not a weakly prime, because it can be changed into another prime (2691478217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1345739408 + 1345739409.

It is an arithmetic number, because the mean of its divisors is an integer number (1345739409).

Almost surely, 2^2691478817 is an apocalyptic number.

It is an amenable number.

2691478817 is a deficient number, since it is larger than the sum of its proper divisors (1).

2691478817 is an equidigital number, since it uses as much as digits as its factorization.

2691478817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1354752, while the sum is 53.

The square root of 2691478817 is about 51879.4643091079. The cubic root of 2691478817 is about 1391.0102238094.

The spelling of 2691478817 in words is "two billion, six hundred ninety-one million, four hundred seventy-eight thousand, eight hundred seventeen".