51405142331 has 4 divisors (see below), whose sum is σ = 51405841992. Its totient is φ = 51404442672.

The previous prime is 51405142247. The next prime is 51405142339. The reversal of 51405142331 is 13324150415.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13324150415 = 5 ⋅2664830083.

It is a cyclic number.

It is not a de Polignac number, because 51405142331 - 2³⁰ = 50331400507 is a prime.

It is a super-2 number, since 2×51405142331² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51405142294 and 51405142303.

It is not an unprimeable number, because it can be changed into a prime (51405142339) 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, 224705 + ... + 391538.

It is an arithmetic number, because the mean of its divisors is an integer number (12851460498).

Almost surely, 2^51405142331 is an apocalyptic number.

51405142331 is a deficient number, since it is larger than the sum of its proper divisors (699661).

51405142331 is an equidigital number, since it uses as much as digits as its factorization.

51405142331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699660.

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 51405142331 its reverse (13324150415), we get a palindrome (64729292746).

The spelling of 51405142331 in words is "fifty-one billion, four hundred five million, one hundred forty-two thousand, three hundred thirty-one".