2109726517 has 2 divisors, whose sum is σ = 2109726518. Its totient is φ = 2109726516.

The previous prime is 2109726491. The next prime is 2109726529. The reversal of 2109726517 is 7156279012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1413083281 + 696643236 = 37591^2 + 26394^2 .

It is a cyclic number.

It is not a de Polignac number, because 2109726517 - 2¹⁵ = 2109693749 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2109726517.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2109726557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1054863258 + 1054863259.

It is an arithmetic number, because the mean of its divisors is an integer number (1054863259).

Almost surely, 2^2109726517 is an apocalyptic number.

It is an amenable number.

2109726517 is a deficient number, since it is larger than the sum of its proper divisors (1).

2109726517 is an equidigital number, since it uses as much as digits as its factorization.

2109726517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52920, while the sum is 40.

The square root of 2109726517 is about 45931.7593501490. The cubic root of 2109726517 is about 1282.5531958272.

The spelling of 2109726517 in words is "two billion, one hundred nine million, seven hundred twenty-six thousand, five hundred seventeen".