2278681 has 2 divisors, whose sum is σ = 2278682. Its totient is φ = 2278680.

The previous prime is 2278649. The next prime is 2278691. The reversal of 2278681 is 1868722.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2277081 + 1600 = 1509^2 + 40^2 .

It is a cyclic number.

It is not a de Polignac number, because 2278681 - 2⁵ = 2278649 is a prime.

It is a super-2 number, since 2×2278681² = 10384774199522, which contains 22 as substring.

2278681 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (2278631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1139340 + 1139341.

It is an arithmetic number, because the mean of its divisors is an integer number (1139341).

2^2278681 is an apocalyptic number.

It is an amenable number.

2278681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2278681 is an equidigital number, since it uses as much as digits as its factorization.

2278681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10752, while the sum is 34.

The square root of 2278681 is about 1509.5300593231. The cubic root of 2278681 is about 131.5915019010.

The spelling of 2278681 in words is "two million, two hundred seventy-eight thousand, six hundred eighty-one".