55543381 has 4 divisors (see below), whose sum is σ = 57458700. Its totient is φ = 53628064.

The previous prime is 55543343. The next prime is 55543451. The reversal of 55543381 is 18334555.

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 9180900 + 46362481 = 3030^2 + 6809^2 .

It is a cyclic number.

It is not a de Polignac number, because 55543381 - 2¹¹ = 55541333 is a prime.

It is a super-2 number, since 2×55543381² = 6170134345822322, 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 (55543181) 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, 957616 + ... + 957673.

It is an arithmetic number, because the mean of its divisors is an integer number (14364675).

Almost surely, 2^55543381 is an apocalyptic number.

It is an amenable number.

55543381 is a deficient number, since it is larger than the sum of its proper divisors (1915319).

55543381 is a wasteful number, since it uses less digits than its factorization.

55543381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1915318.

The product of its digits is 36000, while the sum is 34.

The square root of 55543381 is about 7452.7431862369. The cubic root of 55543381 is about 381.5435393739.

The spelling of 55543381 in words is "fifty-five million, five hundred forty-three thousand, three hundred eighty-one".