563661461 has 4 divisors (see below), whose sum is σ = 614903424. Its totient is φ = 512419500.

The previous prime is 563661457. The next prime is 563661463. The reversal of 563661461 is 164166365.

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 a cyclic number.

It is not a de Polignac number, because 563661461 - 2² = 563661457 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (563661463) 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, 25620965 + ... + 25620986.

It is an arithmetic number, because the mean of its divisors is an integer number (153725856).

Almost surely, 2^563661461 is an apocalyptic number.

It is an amenable number.

563661461 is a deficient number, since it is larger than the sum of its proper divisors (51241963).

563661461 is a wasteful number, since it uses less digits than its factorization.

563661461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51241962.

The product of its digits is 77760, while the sum is 38.

The square root of 563661461 is about 23741.5555724557. Note that the first 4 decimals coincide. The cubic root of 563661461 is about 826.0495786206.

The spelling of 563661461 in words is "five hundred sixty-three million, six hundred sixty-one thousand, four hundred sixty-one".