2105616749 has 2 divisors, whose sum is σ = 2105616750. Its totient is φ = 2105616748.

The previous prime is 2105616707. The next prime is 2105616763. The reversal of 2105616749 is 9476165012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1729062724 + 376554025 = 41582^2 + 19405^2 .

It is a cyclic number.

It is not a de Polignac number, because 2105616749 - 2²⁸ = 1837181293 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2105613749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1052808374 + 1052808375.

It is an arithmetic number, because the mean of its divisors is an integer number (1052808375).

Almost surely, 2^2105616749 is an apocalyptic number.

It is an amenable number.

2105616749 is a deficient number, since it is larger than the sum of its proper divisors (1).

2105616749 is an equidigital number, since it uses as much as digits as its factorization.

2105616749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 2105616749 is about 45886.9997820734. Note that the first 3 decimals coincide. The cubic root of 2105616749 is about 1281.7198457224.

The spelling of 2105616749 in words is "two billion, one hundred five million, six hundred sixteen thousand, seven hundred forty-nine".