82905661 has 2 divisors, whose sum is σ = 82905662. Its totient is φ = 82905660.

The previous prime is 82905653. The next prime is 82905709. The reversal of 82905661 is 16650928.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73102500 + 9803161 = 8550^2 + 3131^2 .

It is a cyclic number.

It is not a de Polignac number, because 82905661 - 2³ = 82905653 is a prime.

It is a super-3 number, since 3×82905661³ (a number of 25 digits) contains 333 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 82905661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82905601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41452830 + 41452831.

It is an arithmetic number, because the mean of its divisors is an integer number (41452831).

Almost surely, 2^82905661 is an apocalyptic number.

It is an amenable number.

82905661 is a deficient number, since it is larger than the sum of its proper divisors (1).

82905661 is an equidigital number, since it uses as much as digits as its factorization.

82905661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 82905661 is about 9105.2545818335. The cubic root of 82905661 is about 436.0417380715.

The spelling of 82905661 in words is "eighty-two million, nine hundred five thousand, six hundred sixty-one".