2825861 has 2 divisors, whose sum is σ = 2825862. Its totient is φ = 2825860.

The previous prime is 2825857. The next prime is 2825863. The reversal of 2825861 is 1685282.

2825861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2825761 + 100 = 1681^2 + 10^2 .

It is a cyclic number.

It is not a de Polignac number, because 2825861 - 2² = 2825857 is a prime.

Together with 2825863, 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 (2825863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1412930 + 1412931.

It is an arithmetic number, because the mean of its divisors is an integer number (1412931).

2^2825861 is an apocalyptic number.

It is an amenable number.

2825861 is a deficient number, since it is larger than the sum of its proper divisors (1).

2825861 is an equidigital number, since it uses as much as digits as its factorization.

2825861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7680, while the sum is 32.

The square root of 2825861 is about 1681.0297439367. The cubic root of 2825861 is about 141.3785745509.

The spelling of 2825861 in words is "two million, eight hundred twenty-five thousand, eight hundred sixty-one".