55111503 has 16 divisors (see below), whose sum is σ = 75753216. Its totient is φ = 35616960.

The previous prime is 55111493. The next prime is 55111517. The reversal of 55111503 is 30511155.

It is not a de Polignac number, because 55111503 - 2⁵ = 55111471 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55111503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55111003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19200 + ... + 21882.

It is an arithmetic number, because the mean of its divisors is an integer number (4734576).

Almost surely, 2^55111503 is an apocalyptic number.

55111503 is a deficient number, since it is larger than the sum of its proper divisors (20641713).

55111503 is a wasteful number, since it uses less digits than its factorization.

55111503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2894.

The product of its (nonzero) digits is 375, while the sum is 21.

The square root of 55111503 is about 7423.7122115556. The cubic root of 55111503 is about 380.5520669090.

Adding to 55111503 its reverse (30511155), we get a palindrome (85622658).

The spelling of 55111503 in words is "fifty-five million, one hundred eleven thousand, five hundred three".