2726261821 has 2 divisors, whose sum is σ = 2726261822. Its totient is φ = 2726261820.

The previous prime is 2726261801. The next prime is 2726261891. The reversal of 2726261821 is 1281626272.

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., 1665782596 + 1060479225 = 40814^2 + 32565^2 .

It is a cyclic number.

It is not a de Polignac number, because 2726261821 - 2¹¹ = 2726259773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2726261801) 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, 1363130910 + 1363130911.

It is an arithmetic number, because the mean of its divisors is an integer number (1363130911).

Almost surely, 2^2726261821 is an apocalyptic number.

It is an amenable number.

2726261821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2726261821 is an equidigital number, since it uses as much as digits as its factorization.

2726261821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 37.

The square root of 2726261821 is about 52213.6171989645. The cubic root of 2726261821 is about 1396.9767791158.

The spelling of 2726261821 in words is "two billion, seven hundred twenty-six million, two hundred sixty-one thousand, eight hundred twenty-one".