2782861 has 2 divisors, whose sum is σ = 2782862. Its totient is φ = 2782860.

The previous prime is 2782859. The next prime is 2782877. The reversal of 2782861 is 1682872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1425636 + 1357225 = 1194^2 + 1165^2 .

It is a cyclic number.

It is not a de Polignac number, because 2782861 - 2¹ = 2782859 is a prime.

Together with 2782859, it forms a pair of twin primes.

2782861 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2782841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1391430 + 1391431.

It is an arithmetic number, because the mean of its divisors is an integer number (1391431).

2^2782861 is an apocalyptic number.

It is an amenable number.

2782861 is a deficient number, since it is larger than the sum of its proper divisors (1).

2782861 is an equidigital number, since it uses as much as digits as its factorization.

2782861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10752, while the sum is 34.

The square root of 2782861 is about 1668.1909363139. The cubic root of 2782861 is about 140.6578057455.

It can be divided in two parts, 27828 and 61, that added together give a square (27889 = 167²).

The spelling of 2782861 in words is "two million, seven hundred eighty-two thousand, eight hundred sixty-one".