2781109 has 2 divisors, whose sum is σ = 2781110. Its totient is φ = 2781108.

The previous prime is 2781089. The next prime is 2781133. The reversal of 2781109 is 9011872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2528100 + 253009 = 1590^2 + 503^2 .

It is a cyclic number.

It is not a de Polignac number, because 2781109 - 2⁹ = 2780597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2781139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1390554 + 1390555.

It is an arithmetic number, because the mean of its divisors is an integer number (1390555).

2^2781109 is an apocalyptic number.

It is an amenable number.

2781109 is a deficient number, since it is larger than the sum of its proper divisors (1).

2781109 is an equidigital number, since it uses as much as digits as its factorization.

2781109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 2781109 is about 1667.6657338927. The cubic root of 2781109 is about 140.6282816683.

The spelling of 2781109 in words is "two million, seven hundred eighty-one thousand, one hundred nine".