2278799981 has 2 divisors, whose sum is σ = 2278799982. Its totient is φ = 2278799980.

The previous prime is 2278799953. The next prime is 2278800053. The reversal of 2278799981 is 1899978722.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2278534756 + 265225 = 47734^2 + 515^2 .

It is a cyclic number.

It is not a de Polignac number, because 2278799981 - 2¹⁴ = 2278783597 is a prime.

It is a super-2 number, since 2×2278799981² = 10385858706811200722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2278799581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1139399990 + 1139399991.

It is an arithmetic number, because the mean of its divisors is an integer number (1139399991).

Almost surely, 2^2278799981 is an apocalyptic number.

It is an amenable number.

2278799981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2278799981 is an equidigital number, since it uses as much as digits as its factorization.

2278799981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9144576, while the sum is 62.

The square root of 2278799981 is about 47736.7780751906. The cubic root of 2278799981 is about 1315.9379220493.

The spelling of 2278799981 in words is "two billion, two hundred seventy-eight million, seven hundred ninety-nine thousand, nine hundred eighty-one".