2611639 has 2 divisors, whose sum is σ = 2611640. Its totient is φ = 2611638.

The previous prime is 2611633. The next prime is 2611643. The reversal of 2611639 is 9361162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2611639 - 2¹⁷ = 2480567 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2611633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1305819 + 1305820.

It is an arithmetic number, because the mean of its divisors is an integer number (1305820).

2^2611639 is an apocalyptic number.

2611639 is a deficient number, since it is larger than the sum of its proper divisors (1).

2611639 is an equidigital number, since it uses as much as digits as its factorization.

2611639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 28.

The square root of 2611639 is about 1616.0566202952. The cubic root of 2611639 is about 137.7117662495.

The spelling of 2611639 in words is "two million, six hundred eleven thousand, six hundred thirty-nine".