2105530649 has 2 divisors, whose sum is σ = 2105530650. Its totient is φ = 2105530648.

The previous prime is 2105530601. The next prime is 2105530663. The reversal of 2105530649 is 9460355012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1400256400 + 705274249 = 37420^2 + 26557^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2105530649 is a prime.

It is a super-2 number, since 2×2105530649² = 8866518627756722402, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2105530549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1052765324 + 1052765325.

It is an arithmetic number, because the mean of its divisors is an integer number (1052765325).

Almost surely, 2^2105530649 is an apocalyptic number.

It is an amenable number.

2105530649 is a deficient number, since it is larger than the sum of its proper divisors (1).

2105530649 is an equidigital number, since it uses as much as digits as its factorization.

2105530649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 2105530649 is about 45886.0615982675. The cubic root of 2105530649 is about 1281.7023753727.

The spelling of 2105530649 in words is "two billion, one hundred five million, five hundred thirty thousand, six hundred forty-nine".