2105980787 has 2 divisors, whose sum is σ = 2105980788. Its totient is φ = 2105980786.

The previous prime is 2105980777. The next prime is 2105980819. The reversal of 2105980787 is 7870895012.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2105980787 is a prime.

It is not a weakly prime, because it can be changed into another prime (2105980777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1052990393 + 1052990394.

It is an arithmetic number, because the mean of its divisors is an integer number (1052990394).

Almost surely, 2^2105980787 is an apocalyptic number.

2105980787 is a deficient number, since it is larger than the sum of its proper divisors (1).

2105980787 is an equidigital number, since it uses as much as digits as its factorization.

2105980787 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 282240, while the sum is 47.

The square root of 2105980787 is about 45890.9662896740. The cubic root of 2105980787 is about 1281.7937065587.

The spelling of 2105980787 in words is "two billion, one hundred five million, nine hundred eighty thousand, seven hundred eighty-seven".