2781061 has 2 divisors, whose sum is σ = 2781062. Its totient is φ = 2781060.

The previous prime is 2781059. The next prime is 2781067. The reversal of 2781061 is 1601872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2772225 + 8836 = 1665^2 + 94^2 .

It is a cyclic number.

It is not a de Polignac number, because 2781061 - 2¹ = 2781059 is a prime.

Together with 2781059, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2781067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1390530 + 1390531.

It is an arithmetic number, because the mean of its divisors is an integer number (1390531).

2^2781061 is an apocalyptic number.

It is an amenable number.

2781061 is a deficient number, since it is larger than the sum of its proper divisors (1).

2781061 is an equidigital number, since it uses as much as digits as its factorization.

2781061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 2781061 is about 1667.6513424574. The cubic root of 2781061 is about 140.6274726150.

The spelling of 2781061 in words is "two million, seven hundred eighty-one thousand, sixty-one".