51311333121 has 24 divisors (see below), whose sum is σ = 75726050400. Its totient is φ = 30795532416.

The previous prime is 51311333113. The next prime is 51311333147. The reversal of 51311333121 is 12133311315.

It is a happy number.

51311333121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51311333121 - 2³ = 51311333113 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 51311333091 and 51311333100.

It is not an unprimeable number, because it can be changed into a prime (51311333191) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 923971 + ... + 977928.

It is an arithmetic number, because the mean of its divisors is an integer number (3155252100).

Almost surely, 2^51311333121 is an apocalyptic number.

51311333121 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

51311333121 is a deficient number, since it is larger than the sum of its proper divisors (24414717279).

51311333121 is a wasteful number, since it uses less digits than its factorization.

51311333121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1901965 (or 1901942 counting only the distinct ones).

The product of its digits is 810, while the sum is 24.

Adding to 51311333121 its reverse (12133311315), we get a palindrome (63444644436).

The spelling of 51311333121 in words is "fifty-one billion, three hundred eleven million, three hundred thirty-three thousand, one hundred twenty-one".