2805281987 has 2 divisors, whose sum is σ = 2805281988. Its totient is φ = 2805281986.

The previous prime is 2805281959. The next prime is 2805282049. The reversal of 2805281987 is 7891825082.

It is a happy number.

2805281987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2805281987 - 2²⁸ = 2536846531 is a prime.

It is not a weakly prime, because it can be changed into another prime (2805281957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1402640993 + 1402640994.

It is an arithmetic number, because the mean of its divisors is an integer number (1402640994).

Almost surely, 2^2805281987 is an apocalyptic number.

2805281987 is a deficient number, since it is larger than the sum of its proper divisors (1).

2805281987 is an equidigital number, since it uses as much as digits as its factorization.

2805281987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 645120, while the sum is 50.

The square root of 2805281987 is about 52964.9127913943. The cubic root of 2805281987 is about 1410.3454692273.

The spelling of 2805281987 in words is "two billion, eight hundred five million, two hundred eighty-one thousand, nine hundred eighty-seven".