2784290681 has 2 divisors, whose sum is σ = 2784290682. Its totient is φ = 2784290680.

The previous prime is 2784290671. The next prime is 2784290683. The reversal of 2784290681 is 1860924872.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2231617600 + 552673081 = 47240^2 + 23509^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2784290681 is a prime.

It is a super-2 number, since 2×2784290681² = 15504549192606887522, which contains 22 as substring.

Together with 2784290683, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2784290683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1392145340 + 1392145341.

It is an arithmetic number, because the mean of its divisors is an integer number (1392145341).

Almost surely, 2^2784290681 is an apocalyptic number.

It is an amenable number.

2784290681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2784290681 is an equidigital number, since it uses as much as digits as its factorization.

2784290681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 387072, while the sum is 47.

The square root of 2784290681 is about 52766.3783199113. The cubic root of 2784290681 is about 1406.8188903781.

The spelling of 2784290681 in words is "two billion, seven hundred eighty-four million, two hundred ninety thousand, six hundred eighty-one".