563557381 has 2 divisors, whose sum is σ = 563557382. Its totient is φ = 563557380.

The previous prime is 563557373. The next prime is 563557399. The reversal of 563557381 is 183755365.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 414936900 + 148620481 = 20370^2 + 12191^2 .

It is a cyclic number.

It is not a de Polignac number, because 563557381 - 2³ = 563557373 is a prime.

It is a super-2 number, since 2×563557381² = 635193843359158322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (563555381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 281778690 + 281778691.

It is an arithmetic number, because the mean of its divisors is an integer number (281778691).

Almost surely, 2^563557381 is an apocalyptic number.

It is an amenable number.

563557381 is a deficient number, since it is larger than the sum of its proper divisors (1).

563557381 is an equidigital number, since it uses as much as digits as its factorization.

563557381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 378000, while the sum is 43.

The square root of 563557381 is about 23739.3635340124. The cubic root of 563557381 is about 825.9987321827.

It can be divided in two parts, 56355 and 7381, that added together give a palindrome (63736).

The spelling of 563557381 in words is "five hundred sixty-three million, five hundred fifty-seven thousand, three hundred eighty-one".