55431 has 8 divisors (see below), whose sum is σ = 82160. Its totient is φ = 36936.

The previous prime is 55411. The next prime is 55439. The reversal of 55431 is 13455.

55431 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 55431 - 2⁵ = 55399 is a prime.

It is a super-2 number, since 2×55431² = 6145191522, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 10 and base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55439) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1000 + ... + 1053.

It is an arithmetic number, because the mean of its divisors is an integer number (10270).

2⁵⁵⁴³¹ is an apocalyptic number.

55431 is a deficient number, since it is larger than the sum of its proper divisors (26729).

55431 is a wasteful number, since it uses less digits than its factorization.

55431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2062 (or 2056 counting only the distinct ones).

The product of its digits is 300, while the sum is 18.

The square root of 55431 is about 235.4378898988. The cubic root of 55431 is about 38.1286039771.

Adding to 55431 its reverse (13455), we get a palindrome (68886).

It can be divided in two parts, 554 and 31, that added together give a palindrome (585).

The spelling of 55431 in words is "fifty-five thousand, four hundred thirty-one".