82561769 has 2 divisors, whose sum is σ = 82561770. Its totient is φ = 82561768.

The previous prime is 82561727. The next prime is 82561771. The reversal of 82561769 is 96716528.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80766169 + 1795600 = 8987^2 + 1340^2 .

It is a cyclic number.

It is not a de Polignac number, because 82561769 - 2²⁰ = 81513193 is a prime.

It is a super-3 number, since 3×82561769³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 82561771, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (82561799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41280884 + 41280885.

It is an arithmetic number, because the mean of its divisors is an integer number (41280885).

Almost surely, 2^82561769 is an apocalyptic number.

It is an amenable number.

82561769 is a deficient number, since it is larger than the sum of its proper divisors (1).

82561769 is an equidigital number, since it uses as much as digits as its factorization.

82561769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 44.

The square root of 82561769 is about 9086.3506976123. The cubic root of 82561769 is about 435.4380033570.

The spelling of 82561769 in words is "eighty-two million, five hundred sixty-one thousand, seven hundred sixty-nine".