2155503 has 8 divisors (see below), whose sum is σ = 3284608. Its totient is φ = 1231704.

The previous prime is 2155499. The next prime is 2155511. The reversal of 2155503 is 3055512.

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

It is not a de Polignac number, because 2155503 - 2² = 2155499 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 102643 = 2155503 / (2 + 1 + 5 + 5 + 5 + 0 + 3).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2155503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155513) 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 7 ways as a sum of consecutive naturals, for example, 51301 + ... + 51342.

It is an arithmetic number, because the mean of its divisors is an integer number (410576).

2^2155503 is an apocalyptic number.

2155503 is a deficient number, since it is larger than the sum of its proper divisors (1129105).

2155503 is a wasteful number, since it uses less digits than its factorization.

2155503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102653.

The product of its (nonzero) digits is 750, while the sum is 21.

The square root of 2155503 is about 1468.1631380742. The cubic root of 2155503 is about 129.1763108073.

Subtracting 2155503 from its reverse (3055512), we obtain a palindrome (900009).

The spelling of 2155503 in words is "two million, one hundred fifty-five thousand, five hundred three".