564740981 has 16 divisors (see below), whose sum is σ = 668236800. Its totient is φ = 467043840.

The previous prime is 564740977. The next prime is 564740993. The reversal of 564740981 is 189047465.

It is a cyclic number.

It is not a de Polignac number, because 564740981 - 2² = 564740977 is a prime.

It is a super-2 number, since 2×564740981² = 637864751241684722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (564745981) 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, 72005 + ... + 79461.

It is an arithmetic number, because the mean of its divisors is an integer number (41764800).

Almost surely, 2^564740981 is an apocalyptic number.

It is an amenable number.

564740981 is a deficient number, since it is larger than the sum of its proper divisors (103495819).

564740981 is a wasteful number, since it uses less digits than its factorization.

564740981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7844.

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 564740981 is about 23764.2795177973. The cubic root of 564740981 is about 826.5765902077.

The spelling of 564740981 in words is "five hundred sixty-four million, seven hundred forty thousand, nine hundred eighty-one".