2106517649 has 2 divisors, whose sum is σ = 2106517650. Its totient is φ = 2106517648.

The previous prime is 2106517627. The next prime is 2106517657. The reversal of 2106517649 is 9467156012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1346523025 + 759994624 = 36695^2 + 27568^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2106517649 is a prime.

It is not a weakly prime, because it can be changed into another prime (2106517849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1053258824 + 1053258825.

It is an arithmetic number, because the mean of its divisors is an integer number (1053258825).

Almost surely, 2^2106517649 is an apocalyptic number.

It is an amenable number.

2106517649 is a deficient number, since it is larger than the sum of its proper divisors (1).

2106517649 is an equidigital number, since it uses as much as digits as its factorization.

2106517649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 2106517649 is about 45896.8152380969. The cubic root of 2106517649 is about 1281.9026166796.

The spelling of 2106517649 in words is "two billion, one hundred six million, five hundred seventeen thousand, six hundred forty-nine".