55431222 has 32 divisors (see below), whose sum is σ = 138219264. Its totient is φ = 14397600.

The previous prime is 55431199. The next prime is 55431223. The reversal of 55431222 is 22213455.

55431222 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 55431192 and 55431201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55431223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59529 + ... + 60452.

It is an arithmetic number, because the mean of its divisors is an integer number (4319352).

Almost surely, 2^55431222 is an apocalyptic number.

55431222 is an abundant number, since it is smaller than the sum of its proper divisors (82788042).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55431222 is a wasteful number, since it uses less digits than its factorization.

55431222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120004.

The product of its digits is 2400, while the sum is 24.

The square root of 55431222 is about 7445.2147047617. The cubic root of 55431222 is about 381.2865487849.

Adding to 55431222 its reverse (22213455), we get a palindrome (77644677).

The spelling of 55431222 in words is "fifty-five million, four hundred thirty-one thousand, two hundred twenty-two".