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2640881 is a prime number
BaseRepresentation
bin1010000100101111110001
311222011121102
422010233301
51134002011
6132334145
731306235
oct12045761
94864542
102640881
111544151
12a74355
13716069
144ca5c5
1537273b
hex284bf1

2640881 has 2 divisors, whose sum is σ = 2640882. Its totient is φ = 2640880.

The previous prime is 2640871. The next prime is 2640889. The reversal of 2640881 is 1880462.

2640881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2640625 + 256 = 1625^2 + 16^2 .

It is a cyclic number.

It is not a de Polignac number, because 2640881 - 218 = 2378737 is a prime.

It is a super-2 number, since 2×26408812 = 13948504912322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2640889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1320440 + 1320441.

It is an arithmetic number, because the mean of its divisors is an integer number (1320441).

22640881 is an apocalyptic number.

It is an amenable number.

2640881 is a deficient number, since it is larger than the sum of its proper divisors (1).

2640881 is an equidigital number, since it uses as much as digits as its factorization.

2640881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 2640881 is about 1625.0787673218. The cubic root of 2640881 is about 138.2238368370.

The spelling of 2640881 in words is "two million, six hundred forty thousand, eight hundred eighty-one".