51123503 has 4 divisors (see below), whose sum is σ = 53346288. Its totient is φ = 48900720.

The previous prime is 51123497. The next prime is 51123511. The reversal of 51123503 is 30532115.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30532115 = 5 ⋅6106423.

It is a cyclic number.

It is not a de Polignac number, because 51123503 - 2⁴ = 51123487 is a prime.

It is a super-2 number, since 2×51123503² = 5227225117982018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51123703) 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, 1111358 + ... + 1111403.

It is an arithmetic number, because the mean of its divisors is an integer number (13336572).

Almost surely, 2^51123503 is an apocalyptic number.

51123503 is a deficient number, since it is larger than the sum of its proper divisors (2222785).

51123503 is a wasteful number, since it uses less digits than its factorization.

51123503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2222784.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 51123503 is about 7150.0701395161. The cubic root of 51123503 is about 371.1420834592.

Adding to 51123503 its reverse (30532115), we get a palindrome (81655618).

The spelling of 51123503 in words is "fifty-one million, one hundred twenty-three thousand, five hundred three".