2649401917 has 2 divisors, whose sum is σ = 2649401918. Its totient is φ = 2649401916.

The previous prime is 2649401897. The next prime is 2649401969. The reversal of 2649401917 is 7191049462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1660236516 + 989165401 = 40746^2 + 31451^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2649401917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2649401987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1324700958 + 1324700959.

It is an arithmetic number, because the mean of its divisors is an integer number (1324700959).

Almost surely, 2^2649401917 is an apocalyptic number.

It is an amenable number.

2649401917 is a deficient number, since it is larger than the sum of its proper divisors (1).

2649401917 is an equidigital number, since it uses as much as digits as its factorization.

2649401917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 2649401917 is about 51472.3412815077. The cubic root of 2649401917 is about 1383.7233896851.

The spelling of 2649401917 in words is "two billion, six hundred forty-nine million, four hundred one thousand, nine hundred seventeen".