2781109949 has 2 divisors, whose sum is σ = 2781109950. Its totient is φ = 2781109948.

The previous prime is 2781109937. The next prime is 2781109993. The reversal of 2781109949 is 9499011872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2618368900 + 162741049 = 51170^2 + 12757^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2781109949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2781109897 and 2781109906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2781102949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1390554974 + 1390554975.

It is an arithmetic number, because the mean of its divisors is an integer number (1390554975).

Almost surely, 2^2781109949 is an apocalyptic number.

It is an amenable number.

2781109949 is a deficient number, since it is larger than the sum of its proper divisors (1).

2781109949 is an equidigital number, since it uses as much as digits as its factorization.

2781109949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 50.

The square root of 2781109949 is about 52736.2299467833. The cubic root of 2781109949 is about 1406.2829766384.

The spelling of 2781109949 in words is "two billion, seven hundred eighty-one million, one hundred nine thousand, nine hundred forty-nine".