563914981 has 8 divisors (see below), whose sum is σ = 657627200. Its totient is φ = 483355404.

The previous prime is 563914969. The next prime is 563914991. The reversal of 563914981 is 189419365.

It is not a de Polignac number, because 563914981 - 2⁹ = 563914469 is a prime.

It is a super-2 number, since 2×563914981² = 636000211592460722, 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 (563914961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 821691 + ... + 822376.

It is an arithmetic number, because the mean of its divisors is an integer number (82203400).

Almost surely, 2^563914981 is an apocalyptic number.

It is an amenable number.

563914981 is a deficient number, since it is larger than the sum of its proper divisors (93712219).

563914981 is an equidigital number, since it uses as much as digits as its factorization.

563914981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1644088 (or 1644074 counting only the distinct ones).

The product of its digits is 233280, while the sum is 46.

The square root of 563914981 is about 23746.8941337599. The cubic root of 563914981 is about 826.1734051337.

The spelling of 563914981 in words is "five hundred sixty-three million, nine hundred fourteen thousand, nine hundred eighty-one".