55009903 has 8 divisors (see below), whose sum is σ = 61152896. Its totient is φ = 49140000.

The previous prime is 55009901. The next prime is 55009939. The reversal of 55009903 is 30990055.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 55009903 - 2¹ = 55009901 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55009901) 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, 67848 + ... + 68653.

It is an arithmetic number, because the mean of its divisors is an integer number (7644112).

Almost surely, 2^55009903 is an apocalyptic number.

55009903 is a deficient number, since it is larger than the sum of its proper divisors (6142993).

55009903 is a wasteful number, since it uses less digits than its factorization.

55009903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136545.

The product of its (nonzero) digits is 6075, while the sum is 31.

The square root of 55009903 is about 7416.8661171684. The cubic root of 55009903 is about 380.3180693356.

Adding to 55009903 its reverse (30990055), we get a palindrome (85999958).

The spelling of 55009903 in words is "fifty-five million, nine thousand, nine hundred three".