54471781 has 12 divisors (see below), whose sum is σ = 68240172. Its totient is φ = 43098048.

The previous prime is 54471779. The next prime is 54471787. The reversal of 54471781 is 18717445.

54471781 is nontrivially palindromic in base 14.

It can be written as a sum of positive squares in 2 ways, for example, as 15920100 + 38551681 = 3990^2 + 6209^2 .

It is not a de Polignac number, because 54471781 - 2¹ = 54471779 is a prime.

It is a super-2 number, since 2×54471781² = 5934349850623922, which contains 22 as substring.

It is the 7381-st Hogben number.

It is a self number, because there is not a number n which added to its sum of digits gives 54471781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54471787) by changing a digit.

It is a nontrivial repunit in base 7380.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42120 + ... + 43393.

It is an arithmetic number, because the mean of its divisors is an integer number (5686681).

Almost surely, 2^54471781 is an apocalyptic number.

It is an amenable number.

54471781 is a deficient number, since it is larger than the sum of its proper divisors (13768391).

54471781 is a wasteful number, since it uses less digits than its factorization.

54471781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85540 (or 85533 counting only the distinct ones).

The product of its digits is 31360, while the sum is 37.

The square root of 54471781 is about 7380.5000508096. The cubic root of 54471781 is about 379.0738781496.

The spelling of 54471781 in words is "fifty-four million, four hundred seventy-one thousand, seven hundred eighty-one".