561681477 has 24 divisors (see below), whose sum is σ = 976023360. Its totient is φ = 304067520.

The previous prime is 561681457. The next prime is 561681481. The reversal of 561681477 is 774186165.

561681477 is a `hidden beast` number, since 561 + 6 + 8 + 14 + 77 = 666.

It is not a de Polignac number, because 561681477 - 2⁸ = 561681221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561681457) 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 23 ways as a sum of consecutive naturals, for example, 233424 + ... + 235817.

It is an arithmetic number, because the mean of its divisors is an integer number (40667640).

Almost surely, 2^561681477 is an apocalyptic number.

561681477 is a gapful number since it is divisible by the number (57) formed by its first and last digit.

It is an amenable number.

561681477 is a deficient number, since it is larger than the sum of its proper divisors (414341883).

561681477 is a wasteful number, since it uses less digits than its factorization.

561681477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469273 (or 469270 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 561681477 is about 23699.8201891913. The cubic root of 561681477 is about 825.0812173486.

The spelling of 561681477 in words is "five hundred sixty-one million, six hundred eighty-one thousand, four hundred seventy-seven".