51931135549 has 2 divisors, whose sum is σ = 51931135550. Its totient is φ = 51931135548.

The previous prime is 51931135541. The next prime is 51931135567. The reversal of 51931135549 is 94553113915.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51913344025 + 17791524 = 227845^2 + 4218^2 .

It is a cyclic number.

It is not a de Polignac number, because 51931135549 - 2³ = 51931135541 is a prime.

It is a super-3 number, since 3×51931135549³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 51931135499 and 51931135508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51931135541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25965567774 + 25965567775.

It is an arithmetic number, because the mean of its divisors is an integer number (25965567775).

Almost surely, 2^51931135549 is an apocalyptic number.

It is an amenable number.

51931135549 is a deficient number, since it is larger than the sum of its proper divisors (1).

51931135549 is an equidigital number, since it uses as much as digits as its factorization.

51931135549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 364500, while the sum is 46.

The spelling of 51931135549 in words is "fifty-one billion, nine hundred thirty-one million, one hundred thirty-five thousand, five hundred forty-nine".