55388903 has 4 divisors (see below), whose sum is σ = 55416960. Its totient is φ = 55360848.

The previous prime is 55388863. The next prime is 55388911. The reversal of 55388903 is 30988355.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30988355 = 5 ⋅6197671.

It is a cyclic number.

It is not a de Polignac number, because 55388903 - 2⁸ = 55388647 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 (55388953) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10823 + ... + 15096.

It is an arithmetic number, because the mean of its divisors is an integer number (13854240).

Almost surely, 2^55388903 is an apocalyptic number.

55388903 is a deficient number, since it is larger than the sum of its proper divisors (28057).

55388903 is a wasteful number, since it uses less digits than its factorization.

55388903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28056.

The product of its (nonzero) digits is 129600, while the sum is 41.

The square root of 55388903 is about 7442.3721352805. The cubic root of 55388903 is about 381.1894929328.

It can be divided in two parts, 5538 and 8903, that added together give a palindrome (14441).

The spelling of 55388903 in words is "fifty-five million, three hundred eighty-eight thousand, nine hundred three".