51113123 has 4 divisors (see below), whose sum is σ = 51180360. Its totient is φ = 51045888.

The previous prime is 51113119. The next prime is 51113129. The reversal of 51113123 is 32131115.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51113123 - 2² = 51113119 is a prime.

It is a super-2 number, since 2×51113123² = 5225102685626258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51113129) 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, 32465 + ... + 34002.

It is an arithmetic number, because the mean of its divisors is an integer number (12795090).

Almost surely, 2^51113123 is an apocalyptic number.

51113123 is a deficient number, since it is larger than the sum of its proper divisors (67237).

51113123 is an equidigital number, since it uses as much as digits as its factorization.

51113123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67236.

The product of its digits is 90, while the sum is 17.

The square root of 51113123 is about 7149.3442356625. The cubic root of 51113123 is about 371.1169631436.

Adding to 51113123 its reverse (32131115), we get a palindrome (83244238).

The spelling of 51113123 in words is "fifty-one million, one hundred thirteen thousand, one hundred twenty-three".