51080035781 has 2 divisors, whose sum is σ = 51080035782. Its totient is φ = 51080035780.

The previous prime is 51080035777. The next prime is 51080035819. The reversal of 51080035781 is 18753008015.

It is an a-pointer prime, because the next prime (51080035819) can be obtained adding 51080035781 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31314487681 + 19765548100 = 176959^2 + 140590^2 .

It is a cyclic number.

It is not a de Polignac number, because 51080035781 - 2² = 51080035777 is a prime.

It is a super-2 number, since 2×51080035781² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51080035481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25540017890 + 25540017891.

It is an arithmetic number, because the mean of its divisors is an integer number (25540017891).

Almost surely, 2^51080035781 is an apocalyptic number.

It is an amenable number.

51080035781 is a deficient number, since it is larger than the sum of its proper divisors (1).

51080035781 is an equidigital number, since it uses as much as digits as its factorization.

51080035781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 33600, while the sum is 38.

The spelling of 51080035781 in words is "fifty-one billion, eighty million, thirty-five thousand, seven hundred eighty-one".