2782679981 has 2 divisors, whose sum is σ = 2782679982. Its totient is φ = 2782679980.

The previous prime is 2782679951. The next prime is 2782680023. The reversal of 2782679981 is 1899762872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2593864900 + 188815081 = 50930^2 + 13741^2 .

It is a cyclic number.

It is not a de Polignac number, because 2782679981 - 2¹⁰ = 2782678957 is a prime.

It is a super-2 number, since 2×2782679981² = 15486615753316320722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2782679981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2782679951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1391339990 + 1391339991.

It is an arithmetic number, because the mean of its divisors is an integer number (1391339991).

Almost surely, 2^2782679981 is an apocalyptic number.

It is an amenable number.

2782679981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2782679981 is an equidigital number, since it uses as much as digits as its factorization.

2782679981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6096384, while the sum is 59.

The square root of 2782679981 is about 52751.1135522275. The cubic root of 2782679981 is about 1406.5475585217.

The spelling of 2782679981 in words is "two billion, seven hundred eighty-two million, six hundred seventy-nine thousand, nine hundred eighty-one".