2611643 has 2 divisors, whose sum is σ = 2611644. Its totient is φ = 2611642.

The previous prime is 2611639. The next prime is 2611663. The reversal of 2611643 is 3461162.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2611643 - 2² = 2611639 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (2611603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1305821 + 1305822.

It is an arithmetic number, because the mean of its divisors is an integer number (1305822).

2^2611643 is an apocalyptic number.

2611643 is a deficient number, since it is larger than the sum of its proper divisors (1).

2611643 is an equidigital number, since it uses as much as digits as its factorization.

2611643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 23.

The square root of 2611643 is about 1616.0578578751. The cubic root of 2611643 is about 137.7118365562.

The spelling of 2611643 in words is "two million, six hundred eleven thousand, six hundred forty-three".