54563781 has 4 divisors (see below), whose sum is σ = 72751712. Its totient is φ = 36375852.

The previous prime is 54563779. The next prime is 54563791. The reversal of 54563781 is 18736545.

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 not a de Polignac number, because 54563781 - 2¹ = 54563779 is a prime.

It is a super-2 number, since 2×54563781² = 5954412394031922, which contains 22 as substring.

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 (54563701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9093961 + ... + 9093966.

It is an arithmetic number, because the mean of its divisors is an integer number (18187928).

Almost surely, 2^54563781 is an apocalyptic number.

It is an amenable number.

54563781 is a deficient number, since it is larger than the sum of its proper divisors (18187931).

54563781 is a wasteful number, since it uses less digits than its factorization.

54563781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18187930.

The product of its digits is 100800, while the sum is 39.

The square root of 54563781 is about 7386.7300614006. The cubic root of 54563781 is about 379.2871701248.

The spelling of 54563781 in words is "fifty-four million, five hundred sixty-three thousand, seven hundred eighty-one".