983561 has 4 divisors (see below), whose sum is σ = 985872. Its totient is φ = 981252.

The previous prime is 983557. The next prime is 983579. The reversal of 983561 is 165389.

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, and also an emirpimes, since its reverse is a distinct semiprime: 165389 = 7 ⋅23627.

It is a cyclic number.

It is not a de Polignac number, because 983561 - 2² = 983557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (983531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 311 + ... + 1436.

It is an arithmetic number, because the mean of its divisors is an integer number (246468).

2⁹⁸³⁵⁶¹ is an apocalyptic number.

It is an amenable number.

983561 is a deficient number, since it is larger than the sum of its proper divisors (2311).

983561 is a wasteful number, since it uses less digits than its factorization.

983561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2310.

The product of its digits is 6480, while the sum is 32.

The square root of 983561 is about 991.7464393685. The cubic root of 983561 is about 99.4490029317.

The spelling of 983561 in words is "nine hundred eighty-three thousand, five hundred sixty-one".