2820887261 has 2 divisors, whose sum is σ = 2820887262. Its totient is φ = 2820887260.

The previous prime is 2820887249. The next prime is 2820887263. The reversal of 2820887261 is 1627880282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2628510361 + 192376900 = 51269^2 + 13870^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2820887261 is a prime.

Together with 2820887263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2820887263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1410443630 + 1410443631.

It is an arithmetic number, because the mean of its divisors is an integer number (1410443631).

Almost surely, 2^2820887261 is an apocalyptic number.

It is an amenable number.

2820887261 is a deficient number, since it is larger than the sum of its proper divisors (1).

2820887261 is an equidigital number, since it uses as much as digits as its factorization.

2820887261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 172032, while the sum is 44.

The square root of 2820887261 is about 53112.0255780176. The cubic root of 2820887261 is about 1412.9558001282.

The spelling of 2820887261 in words is "two billion, eight hundred twenty million, eight hundred eighty-seven thousand, two hundred sixty-one".