2100697849 has 2 divisors, whose sum is σ = 2100697850. Its totient is φ = 2100697848.

The previous prime is 2100697787. The next prime is 2100697861. The reversal of 2100697849 is 9487960012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2099472400 + 1225449 = 45820^2 + 1107^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100697849 - 2⁷ = 2100697721 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2100697799 and 2100697808.

It is not a weakly prime, because it can be changed into another prime (2100697649) 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, 1050348924 + 1050348925.

It is an arithmetic number, because the mean of its divisors is an integer number (1050348925).

Almost surely, 2^2100697849 is an apocalyptic number.

It is an amenable number.

2100697849 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100697849 is an equidigital number, since it uses as much as digits as its factorization.

2100697849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 2100697849 is about 45833.3704739243. The cubic root of 2100697849 is about 1280.7209986254.

The spelling of 2100697849 in words is "two billion, one hundred million, six hundred ninety-seven thousand, eight hundred forty-nine".