51113503 has 4 divisors (see below), whose sum is σ = 58415440. Its totient is φ = 43811568.

The previous prime is 51113483. The next prime is 51113507. The reversal of 51113503 is 30531115.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30531115 = 5 ⋅6106223.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51113503 is a prime.

It is a super-2 number, since 2×51113503² = 5225180377862018, 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 (51113507) 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, 3650958 + ... + 3650971.

It is an arithmetic number, because the mean of its divisors is an integer number (14603860).

Almost surely, 2^51113503 is an apocalyptic number.

51113503 is a deficient number, since it is larger than the sum of its proper divisors (7301937).

51113503 is an equidigital number, since it uses as much as digits as its factorization.

51113503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7301936.

The product of its (nonzero) digits is 225, while the sum is 19.

The square root of 51113503 is about 7149.3708114770. The cubic root of 51113503 is about 371.1178828298.

Adding to 51113503 its reverse (30531115), we get a palindrome (81644618).

The spelling of 51113503 in words is "fifty-one million, one hundred thirteen thousand, five hundred three".