2812780261 has 2 divisors, whose sum is σ = 2812780262. Its totient is φ = 2812780260.

The previous prime is 2812780259. The next prime is 2812780279. The reversal of 2812780261 is 1620872182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2692987236 + 119793025 = 51894^2 + 10945^2 .

It is a cyclic number.

It is not a de Polignac number, because 2812780261 - 2¹ = 2812780259 is a prime.

Together with 2812780259, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 2812780261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2812780661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1406390130 + 1406390131.

It is an arithmetic number, because the mean of its divisors is an integer number (1406390131).

Almost surely, 2^2812780261 is an apocalyptic number.

It is an amenable number.

2812780261 is a deficient number, since it is larger than the sum of its proper divisors (1).

2812780261 is an equidigital number, since it uses as much as digits as its factorization.

2812780261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 2812780261 is about 53035.6508492165. The cubic root of 2812780261 is about 1411.6009281106.

The spelling of 2812780261 in words is "two billion, eight hundred twelve million, seven hundred eighty thousand, two hundred sixty-one".