2149020917 has 2 divisors, whose sum is σ = 2149020918. Its totient is φ = 2149020916.

The previous prime is 2149020899. The next prime is 2149020931. The reversal of 2149020917 is 7190209412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2132038276 + 16982641 = 46174^2 + 4121^2 .

It is a cyclic number.

It is not a de Polignac number, because 2149020917 - 2¹⁰ = 2149019893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2149020217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1074510458 + 1074510459.

It is an arithmetic number, because the mean of its divisors is an integer number (1074510459).

Almost surely, 2^2149020917 is an apocalyptic number.

It is an amenable number.

2149020917 is a deficient number, since it is larger than the sum of its proper divisors (1).

2149020917 is an equidigital number, since it uses as much as digits as its factorization.

2149020917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 2149020917 is about 46357.5335517325. The cubic root of 2149020917 is about 1290.4669337046.

The spelling of 2149020917 in words is "two billion, one hundred forty-nine million, twenty thousand, nine hundred seventeen".