2561983 has 4 divisors (see below), whose sum is σ = 2621608. Its totient is φ = 2502360.

The previous prime is 2561981. The next prime is 2561987. The reversal of 2561983 is 3891652.

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

It is a cyclic number.

It is not a de Polignac number, because 2561983 - 2¹ = 2561981 is a prime.

It is a Duffinian number.

2561983 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2561981) 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, 29748 + ... + 29833.

It is an arithmetic number, because the mean of its divisors is an integer number (655402).

2^2561983 is an apocalyptic number.

2561983 is a deficient number, since it is larger than the sum of its proper divisors (59625).

2561983 is an equidigital number, since it uses as much as digits as its factorization.

2561983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59624.

The product of its digits is 12960, while the sum is 34.

The square root of 2561983 is about 1600.6195675425. The cubic root of 2561983 is about 136.8333883085.

The spelling of 2561983 in words is "two million, five hundred sixty-one thousand, nine hundred eighty-three".