51100123 has 4 divisors (see below), whose sum is σ = 51747040. Its totient is φ = 50453208.

The previous prime is 51100057. The next prime is 51100157. The reversal of 51100123 is 32100115.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32100115 = 5 ⋅6420023.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51100123 is a prime.

It is a super-2 number, since 2×51100123² = 5222445141230258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51107123) 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, 323340 + ... + 323497.

It is an arithmetic number, because the mean of its divisors is an integer number (12936760).

Almost surely, 2^51100123 is an apocalyptic number.

51100123 is a deficient number, since it is larger than the sum of its proper divisors (646917).

51100123 is an equidigital number, since it uses as much as digits as its factorization.

51100123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646916.

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 51100123 is about 7148.4350035515. The cubic root of 51100123 is about 371.0854974500.

Adding to 51100123 its reverse (32100115), we get a palindrome (83200238).

The spelling of 51100123 in words is "fifty-one million, one hundred thousand, one hundred twenty-three".