5565981 has 4 divisors (see below), whose sum is σ = 7421312. Its totient is φ = 3710652.

The previous prime is 5565979. The next prime is 5565983. The reversal of 5565981 is 1895655.

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 an interprime number because it is at equal distance from previous prime (5565979) and next prime (5565983).

It is not a de Polignac number, because 5565981 - 2¹ = 5565979 is a prime.

It is a super-2 number, since 2×5565981² = 61960288984722, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5565983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 927661 + ... + 927666.

It is an arithmetic number, because the mean of its divisors is an integer number (1855328).

Almost surely, 2^5565981 is an apocalyptic number.

It is an amenable number.

5565981 is a deficient number, since it is larger than the sum of its proper divisors (1855331).

5565981 is a wasteful number, since it uses less digits than its factorization.

5565981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1855330.

The product of its digits is 54000, while the sum is 39.

The square root of 5565981 is about 2359.2331381192. The cubic root of 5565981 is about 177.2204791812.

The spelling of 5565981 in words is "five million, five hundred sixty-five thousand, nine hundred eighty-one".