54143581 has 4 divisors (see below), whose sum is σ = 55165212. Its totient is φ = 53121952.

The previous prime is 54143569. The next prime is 54143591. The reversal of 54143581 is 18534145.

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 17347225 + 36796356 = 4165^2 + 6066^2 .

It is a cyclic number.

It is not a de Polignac number, because 54143581 - 2⁵ = 54143549 is a prime.

It is a super-2 number, since 2×54143581² = 5863054727007122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54143501) 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, 510736 + ... + 510841.

It is an arithmetic number, because the mean of its divisors is an integer number (13791303).

Almost surely, 2^54143581 is an apocalyptic number.

It is an amenable number.

54143581 is a deficient number, since it is larger than the sum of its proper divisors (1021631).

54143581 is a wasteful number, since it uses less digits than its factorization.

54143581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1021630.

The product of its digits is 9600, while the sum is 31.

The square root of 54143581 is about 7358.2321925854. The cubic root of 54143581 is about 378.3110198350.

The spelling of 54143581 in words is "fifty-four million, one hundred forty-three thousand, five hundred eighty-one".