82985561 has 8 divisors (see below), whose sum is σ = 85677384. Its totient is φ = 80317440.

The previous prime is 82985549. The next prime is 82985563. The reversal of 82985561 is 16558928.

It can be written as a sum of positive squares in 4 ways, for example, as 4326400 + 78659161 = 2080^2 + 8869^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 82985561 - 2¹⁰ = 82984537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82985563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1331 + ... + 12951.

It is an arithmetic number, because the mean of its divisors is an integer number (10709673).

Almost surely, 2^82985561 is an apocalyptic number.

It is an amenable number.

82985561 is a deficient number, since it is larger than the sum of its proper divisors (2691823).

82985561 is a wasteful number, since it uses less digits than its factorization.

82985561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11851.

The product of its digits is 172800, while the sum is 44.

The square root of 82985561 is about 9109.6411016022. The cubic root of 82985561 is about 436.1817709242.

The spelling of 82985561 in words is "eighty-two million, nine hundred eighty-five thousand, five hundred sixty-one".