2861009 has 2 divisors, whose sum is σ = 2861010. Its totient is φ = 2861008.

The previous prime is 2860999. The next prime is 2861041. The reversal of 2861009 is 9001682.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2265025 + 595984 = 1505^2 + 772^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2861009 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2861059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1430504 + 1430505.

It is an arithmetic number, because the mean of its divisors is an integer number (1430505).

2^2861009 is an apocalyptic number.

It is an amenable number.

2861009 is a deficient number, since it is larger than the sum of its proper divisors (1).

2861009 is an equidigital number, since it uses as much as digits as its factorization.

2861009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 2861009 is about 1691.4517433258. The cubic root of 2861009 is about 141.9623155969.

The spelling of 2861009 in words is "two million, eight hundred sixty-one thousand, nine".