551123503 has 4 divisors (see below), whose sum is σ = 629855440. Its totient is φ = 472391568.

The previous prime is 551123497. The next prime is 551123563. The reversal of 551123503 is 305321155.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 305321155 = 5 ⋅61064231.

It is a cyclic number.

It is not a de Polignac number, because 551123503 - 2²⁵ = 517569071 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 (551123563) 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, 39365958 + ... + 39365971.

It is an arithmetic number, because the mean of its divisors is an integer number (157463860).

Almost surely, 2^551123503 is an apocalyptic number.

551123503 is a deficient number, since it is larger than the sum of its proper divisors (78731937).

551123503 is an equidigital number, since it uses as much as digits as its factorization.

551123503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78731936.

The product of its (nonzero) digits is 2250, while the sum is 25.

The square root of 551123503 is about 23476.0197435596. The cubic root of 551123503 is about 819.8787759525.

Adding to 551123503 its reverse (305321155), we get a palindrome (856444658).

The spelling of 551123503 in words is "five hundred fifty-one million, one hundred twenty-three thousand, five hundred three".