2840320261 has 4 divisors (see below), whose sum is σ = 2840861772. Its totient is φ = 2839778752.

The previous prime is 2840320211. The next prime is 2840320277. The reversal of 2840320261 is 1620230482.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1763496036 + 1076824225 = 41994^2 + 32815^2 .

It is a cyclic number.

It is not a de Polignac number, because 2840320261 - 2²⁷ = 2706102533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2840320211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 262810 + ... + 273403.

It is an arithmetic number, because the mean of its divisors is an integer number (710215443).

Almost surely, 2^2840320261 is an apocalyptic number.

It is an amenable number.

2840320261 is a deficient number, since it is larger than the sum of its proper divisors (541511).

2840320261 is an equidigital number, since it uses as much as digits as its factorization.

2840320261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541510.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 2840320261 is about 53294.6550884796. The cubic root of 2840320261 is about 1416.1929799454.

The spelling of 2840320261 in words is "two billion, eight hundred forty million, three hundred twenty thousand, two hundred sixty-one".