985936561 has 4 divisors (see below), whose sum is σ = 1028803392. Its totient is φ = 943069732.

The previous prime is 985936537. The next prime is 985936579. The reversal of 985936561 is 165639589.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-985936561 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 985936499 and 985936508.

It is not an unprimeable number, because it can be changed into a prime (985936361) 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, 21433381 + ... + 21433426.

It is an arithmetic number, because the mean of its divisors is an integer number (257200848).

Almost surely, 2^985936561 is an apocalyptic number.

It is an amenable number.

985936561 is a deficient number, since it is larger than the sum of its proper divisors (42866831).

985936561 is a wasteful number, since it uses less digits than its factorization.

985936561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42866830.

The product of its digits is 1749600, while the sum is 52.

The square root of 985936561 is about 31399.6267652977. The cubic root of 985936561 is about 995.2900380870.

The spelling of 985936561 in words is "nine hundred eighty-five million, nine hundred thirty-six thousand, five hundred sixty-one".