55431422 has 4 divisors (see below), whose sum is σ = 83147136. Its totient is φ = 27715710.

The previous prime is 55431421. The next prime is 55431443. The reversal of 55431422 is 22413455.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 55431391 and 55431400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55431421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13857854 + ... + 13857857.

It is an arithmetic number, because the mean of its divisors is an integer number (20786784).

Almost surely, 2^55431422 is an apocalyptic number.

55431422 is a deficient number, since it is larger than the sum of its proper divisors (27715714).

55431422 is a wasteful number, since it uses less digits than its factorization.

55431422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27715713.

The product of its digits is 4800, while the sum is 26.

The square root of 55431422 is about 7445.2281361957. The cubic root of 55431422 is about 381.2870073545.

Adding to 55431422 its reverse (22413455), we get a palindrome (77844877).

The spelling of 55431422 in words is "fifty-five million, four hundred thirty-one thousand, four hundred twenty-two".