2639761 has 2 divisors, whose sum is σ = 2639762. Its totient is φ = 2639760.

The previous prime is 2639759. The next prime is 2639773. The reversal of 2639761 is 1679362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1838736 + 801025 = 1356^2 + 895^2 .

It is a cyclic number.

It is not a de Polignac number, because 2639761 - 2¹ = 2639759 is a prime.

Together with 2639759, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2639701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1319880 + 1319881.

It is an arithmetic number, because the mean of its divisors is an integer number (1319881).

2^2639761 is an apocalyptic number.

It is an amenable number.

2639761 is a deficient number, since it is larger than the sum of its proper divisors (1).

2639761 is an equidigital number, since it uses as much as digits as its factorization.

2639761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 34.

The square root of 2639761 is about 1624.7341320967. The cubic root of 2639761 is about 138.2042937896.

The spelling of 2639761 in words is "two million, six hundred thirty-nine thousand, seven hundred sixty-one".