55206431 has 4 divisors (see below), whose sum is σ = 63093072. Its totient is φ = 47319792.

The previous prime is 55206421. The next prime is 55206439. The reversal of 55206431 is 13460255.

55206431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13460255 = 5 ⋅2692051.

It is a cyclic number.

It is not a de Polignac number, because 55206431 - 2²² = 51012127 is a prime.

It is a super-2 number, since 2×55206431² = 6095500047515522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 55206431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55206439) 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 3 ways as a sum of consecutive naturals, for example, 3943310 + ... + 3943323.

It is an arithmetic number, because the mean of its divisors is an integer number (15773268).

Almost surely, 2^55206431 is an apocalyptic number.

55206431 is a deficient number, since it is larger than the sum of its proper divisors (7886641).

55206431 is an equidigital number, since it uses as much as digits as its factorization.

55206431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7886640.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 55206431 is about 7430.1030275495. The cubic root of 55206431 is about 380.7704382895.

Adding to 55206431 its reverse (13460255), we get a palindrome (68666686).

The spelling of 55206431 in words is "fifty-five million, two hundred six thousand, four hundred thirty-one".