55400543 has 4 divisors (see below), whose sum is σ = 60436968. Its totient is φ = 50364120.

The previous prime is 55400539. The next prime is 55400549. The reversal of 55400543 is 34500455.

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

It is a cyclic number.

It is not a de Polignac number, because 55400543 - 2² = 55400539 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55400549) 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, 2518196 + ... + 2518217.

It is an arithmetic number, because the mean of its divisors is an integer number (15109242).

Almost surely, 2^55400543 is an apocalyptic number.

55400543 is a deficient number, since it is larger than the sum of its proper divisors (5036425).

55400543 is a wasteful number, since it uses less digits than its factorization.

55400543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5036424.

The product of its (nonzero) digits is 6000, while the sum is 26.

The square root of 55400543 is about 7443.1541029324. The cubic root of 55400543 is about 381.2161934370.

Adding to 55400543 its reverse (34500455), we get a palindrome (89900998).

The spelling of 55400543 in words is "fifty-five million, four hundred thousand, five hundred forty-three".