2509811 has 2 divisors, whose sum is σ = 2509812. Its totient is φ = 2509810.

The previous prime is 2509807. The next prime is 2509823. The reversal of 2509811 is 1189052.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2509811 - 2² = 2509807 is a prime.

It is a Chen prime.

It is a plaindrome in base 15.

It is not a weakly prime, because it can be changed into another prime (2509831) 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, 1254905 + 1254906.

It is an arithmetic number, because the mean of its divisors is an integer number (1254906).

2^2509811 is an apocalyptic number.

2509811 is a deficient number, since it is larger than the sum of its proper divisors (1).

2509811 is an equidigital number, since it uses as much as digits as its factorization.

2509811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 2509811 is about 1584.2383027815. The cubic root of 2509811 is about 135.8981900957.

The spelling of 2509811 in words is "two million, five hundred nine thousand, eight hundred eleven".