54559781 has 4 divisors (see below), whose sum is σ = 54631500. Its totient is φ = 54488064.

The previous prime is 54559763. The next prime is 54559787. The reversal of 54559781 is 18795545.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31192225 + 23367556 = 5585^2 + 4834^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-54559781 is a prime.

It is a super-2 number, since 2×54559781² = 5953539405535922, 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 (54559787) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34706 + ... + 36243.

It is an arithmetic number, because the mean of its divisors is an integer number (13657875).

Almost surely, 2^54559781 is an apocalyptic number.

It is an amenable number.

54559781 is a deficient number, since it is larger than the sum of its proper divisors (71719).

54559781 is an equidigital number, since it uses as much as digits as its factorization.

54559781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71718.

The product of its digits is 252000, while the sum is 44.

The square root of 54559781 is about 7386.4593006392. The cubic root of 54559781 is about 379.2779015482.

The spelling of 54559781 in words is "fifty-four million, five hundred fifty-nine thousand, seven hundred eighty-one".