2109703657 has 2 divisors, whose sum is σ = 2109703658. Its totient is φ = 2109703656.

The previous prime is 2109703649. The next prime is 2109703691. The reversal of 2109703657 is 7563079012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1738139481 + 371564176 = 41691^2 + 19276^2 .

It is a cyclic number.

It is not a de Polignac number, because 2109703657 - 2³ = 2109703649 is a prime.

It is a super-3 number, since 3×2109703657³ (a number of 29 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (2109703697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1054851828 + 1054851829.

It is an arithmetic number, because the mean of its divisors is an integer number (1054851829).

Almost surely, 2^2109703657 is an apocalyptic number.

It is an amenable number.

2109703657 is a deficient number, since it is larger than the sum of its proper divisors (1).

2109703657 is an equidigital number, since it uses as much as digits as its factorization.

2109703657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 79380, while the sum is 40.

The square root of 2109703657 is about 45931.5105020508. The cubic root of 2109703657 is about 1282.5485634303.

The spelling of 2109703657 in words is "two billion, one hundred nine million, seven hundred three thousand, six hundred fifty-seven".