2899861 has 2 divisors, whose sum is σ = 2899862. Its totient is φ = 2899860.

The previous prime is 2899859. The next prime is 2899867. The reversal of 2899861 is 1689982.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1703025 + 1196836 = 1305^2 + 1094^2 .

It is a cyclic number.

It is not a de Polignac number, because 2899861 - 2¹ = 2899859 is a prime.

Together with 2899859, it forms a pair of twin primes.

2899861 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2899867) 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, 1449930 + 1449931.

It is an arithmetic number, because the mean of its divisors is an integer number (1449931).

2^2899861 is an apocalyptic number.

It is an amenable number.

2899861 is a deficient number, since it is larger than the sum of its proper divisors (1).

2899861 is an equidigital number, since it uses as much as digits as its factorization.

2899861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 43.

The square root of 2899861 is about 1702.8978242983. The cubic root of 2899861 is about 142.6020362871.

The spelling of 2899861 in words is "two million, eight hundred ninety-nine thousand, eight hundred sixty-one".