2781797 has 2 divisors, whose sum is σ = 2781798. Its totient is φ = 2781796.

The previous prime is 2781749. The next prime is 2781803. The reversal of 2781797 is 7971872.

2781797 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2775556 + 6241 = 1666^2 + 79^2 .

It is a cyclic number.

It is not a de Polignac number, because 2781797 - 2¹⁰ = 2780773 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2781707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1390898 + 1390899.

It is an arithmetic number, because the mean of its divisors is an integer number (1390899).

2^2781797 is an apocalyptic number.

It is an amenable number.

2781797 is a deficient number, since it is larger than the sum of its proper divisors (1).

2781797 is an equidigital number, since it uses as much as digits as its factorization.

2781797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 49392, while the sum is 41.

The square root of 2781797 is about 1667.8719974866. The cubic root of 2781797 is about 140.6398770763.

The spelling of 2781797 in words is "two million, seven hundred eighty-one thousand, seven hundred ninety-seven".