2639569 has 2 divisors, whose sum is σ = 2639570. Its totient is φ = 2639568.

The previous prime is 2639561. The next prime is 2639587. The reversal of 2639569 is 9659362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2265025 + 374544 = 1505^2 + 612^2 .

It is a cyclic number.

It is not a de Polignac number, because 2639569 - 2³ = 2639561 is a prime.

It is a super-2 number, since 2×2639569² = 13934649011522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2639561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1319784 + 1319785.

It is an arithmetic number, because the mean of its divisors is an integer number (1319785).

2^2639569 is an apocalyptic number.

It is an amenable number.

2639569 is a deficient number, since it is larger than the sum of its proper divisors (1).

2639569 is an equidigital number, since it uses as much as digits as its factorization.

2639569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 87480, while the sum is 40.

The square root of 2639569 is about 1624.6750444320. The cubic root of 2639569 is about 138.2009429979.

The spelling of 2639569 in words is "two million, six hundred thirty-nine thousand, five hundred sixty-nine".