2644891 has 2 divisors, whose sum is σ = 2644892. Its totient is φ = 2644890.

The previous prime is 2644883. The next prime is 2644903. The reversal of 2644891 is 1984462.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2644891 - 2³ = 2644883 is a prime.

2644891 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (2644091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1322445 + 1322446.

It is an arithmetic number, because the mean of its divisors is an integer number (1322446).

2^2644891 is an apocalyptic number.

2644891 is a deficient number, since it is larger than the sum of its proper divisors (1).

2644891 is an equidigital number, since it uses as much as digits as its factorization.

2644891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 34.

The square root of 2644891 is about 1626.3120856711. The cubic root of 2644891 is about 138.2937626532.

The spelling of 2644891 in words is "two million, six hundred forty-four thousand, eight hundred ninety-one".