565705981 has 16 divisors (see below), whose sum is σ = 606811840. Its totient is φ = 525813120.

The previous prime is 565705969. The next prime is 565705997. The reversal of 565705981 is 189507565.

It is a cyclic number.

It is not a de Polignac number, because 565705981 - 2⁷ = 565705853 is a prime.

It is a super-2 number, since 2×565705981² = 640046513878344722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (565705951) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 291691 + ... + 293623.

It is an arithmetic number, because the mean of its divisors is an integer number (37925740).

Almost surely, 2^565705981 is an apocalyptic number.

It is an amenable number.

565705981 is a deficient number, since it is larger than the sum of its proper divisors (41105859).

565705981 is a wasteful number, since it uses less digits than its factorization.

565705981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2236.

The product of its (nonzero) digits is 378000, while the sum is 46.

The square root of 565705981 is about 23784.5744338636. The cubic root of 565705981 is about 827.0471259882.

The spelling of 565705981 in words is "five hundred sixty-five million, seven hundred five thousand, nine hundred eighty-one".