55643139 has 8 divisors (see below), whose sum is σ = 82434320. Its totient is φ = 37095408.

The previous prime is 55643129. The next prime is 55643143. The reversal of 55643139 is 93134655.

55643139 is a `hidden beast` number, since 5 + 5 + 643 + 1 + 3 + 9 = 666.

It is not a de Polignac number, because 55643139 - 2⁸ = 55642883 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 (55643129) 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, 1030402 + ... + 1030455.

It is an arithmetic number, because the mean of its divisors is an integer number (10304290).

Almost surely, 2^55643139 is an apocalyptic number.

55643139 is a deficient number, since it is larger than the sum of its proper divisors (26791181).

55643139 is a wasteful number, since it uses less digits than its factorization.

55643139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2060866 (or 2060860 counting only the distinct ones).

The product of its digits is 48600, while the sum is 36.

The square root of 55643139 is about 7459.4328872911. The cubic root of 55643139 is about 381.7718249379.

It can be divided in two parts, 55643 and 139, that multiplied together give a palindrome (7734377).

The spelling of 55643139 in words is "fifty-five million, six hundred forty-three thousand, one hundred thirty-nine".