2278891 has 2 divisors, whose sum is σ = 2278892. Its totient is φ = 2278890.

The previous prime is 2278877. The next prime is 2278943. The reversal of 2278891 is 1988722.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2278891 - 2⁹ = 2278379 is a prime.

It is a Chen prime.

2278891 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2278891.

It is not a weakly prime, because it can be changed into another prime (2278811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1139445 + 1139446.

It is an arithmetic number, because the mean of its divisors is an integer number (1139446).

2^2278891 is an apocalyptic number.

2278891 is a deficient number, since it is larger than the sum of its proper divisors (1).

2278891 is an equidigital number, since it uses as much as digits as its factorization.

2278891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 37.

The square root of 2278891 is about 1509.5996157922. The cubic root of 2278891 is about 131.5955442054.

The spelling of 2278891 in words is "two million, two hundred seventy-eight thousand, eight hundred ninety-one".