2109868949 has 2 divisors, whose sum is σ = 2109868950. Its totient is φ = 2109868948.

The previous prime is 2109868921. The next prime is 2109868967. The reversal of 2109868949 is 9498689012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2009728900 + 100140049 = 44830^2 + 10007^2 .

It is a cyclic number.

It is not a de Polignac number, because 2109868949 - 2¹² = 2109864853 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2109868894 and 2109868903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2109868909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1054934474 + 1054934475.

It is an arithmetic number, because the mean of its divisors is an integer number (1054934475).

Almost surely, 2^2109868949 is an apocalyptic number.

It is an amenable number.

2109868949 is a deficient number, since it is larger than the sum of its proper divisors (1).

2109868949 is an equidigital number, since it uses as much as digits as its factorization.

2109868949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2239488, while the sum is 56.

The square root of 2109868949 is about 45933.3097980104. The cubic root of 2109868949 is about 1282.5820577839.

The spelling of 2109868949 in words is "two billion, one hundred nine million, eight hundred sixty-eight thousand, nine hundred forty-nine".