55531443 has 32 divisors (see below), whose sum is σ = 82985472. Its totient is φ = 32748800.

The previous prime is 55531429. The next prime is 55531457. The reversal of 55531443 is 34413555.

It is an interprime number because it is at equal distance from previous prime (55531429) and next prime (55531457).

It is a cyclic number.

It is not a de Polignac number, because 55531443 - 2²⁰ = 54482867 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55531443.

It is not an unprimeable number, because it can be changed into a prime (55531403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 320905 + ... + 321077.

It is an arithmetic number, because the mean of its divisors is an integer number (2593296).

Almost surely, 2^55531443 is an apocalyptic number.

55531443 is a deficient number, since it is larger than the sum of its proper divisors (27454029).

55531443 is a wasteful number, since it uses less digits than its factorization.

55531443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395.

The product of its digits is 18000, while the sum is 30.

The square root of 55531443 is about 7451.9422300498. The cubic root of 55531443 is about 381.5162022243.

Adding to 55531443 its reverse (34413555), we get a palindrome (89944998).

It can be divided in two parts, 5553 and 1443, that added together give a palindrome (6996).

The spelling of 55531443 in words is "fifty-five million, five hundred thirty-one thousand, four hundred forty-three".