829685561 has 4 divisors (see below), whose sum is σ = 878490612. Its totient is φ = 780880512.

The previous prime is 829685557. The next prime is 829685569. The reversal of 829685561 is 165586928.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 753228025 + 76457536 = 27445^2 + 8744^2 .

It is a cyclic number.

It is not a de Polignac number, because 829685561 - 2² = 829685557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (829685569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24402500 + ... + 24402533.

It is an arithmetic number, because the mean of its divisors is an integer number (219622653).

Almost surely, 2^829685561 is an apocalyptic number.

It is an amenable number.

829685561 is a deficient number, since it is larger than the sum of its proper divisors (48805051).

829685561 is a wasteful number, since it uses less digits than its factorization.

829685561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48805050.

The product of its digits is 1036800, while the sum is 50.

The square root of 829685561 is about 28804.2628963145. The cubic root of 829685561 is about 939.6609464537.

The spelling of 829685561 in words is "eight hundred twenty-nine million, six hundred eighty-five thousand, five hundred sixty-one".