2820889261 has 4 divisors (see below), whose sum is σ = 2856596800. Its totient is φ = 2785181724.

The previous prime is 2820889243. The next prime is 2820889273. The reversal of 2820889261 is 1629880282.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2820889261 - 2⁷ = 2820889133 is a prime.

It is a super-2 number, since 2×2820889261² = 15914832445650252242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2820887261) 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, 17853651 + ... + 17853808.

It is an arithmetic number, because the mean of its divisors is an integer number (714149200).

Almost surely, 2^2820889261 is an apocalyptic number.

It is an amenable number.

2820889261 is a deficient number, since it is larger than the sum of its proper divisors (35707539).

2820889261 is an equidigital number, since it uses as much as digits as its factorization.

2820889261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35707538.

The product of its (nonzero) digits is 221184, while the sum is 46.

The square root of 2820889261 is about 53112.0444061420. The cubic root of 2820889261 is about 1412.9561340552.

The spelling of 2820889261 in words is "two billion, eight hundred twenty million, eight hundred eighty-nine thousand, two hundred sixty-one".