51023388781 has 2 divisors, whose sum is σ = 51023388782. Its totient is φ = 51023388780.

The previous prime is 51023388769. The next prime is 51023388803. The reversal of 51023388781 is 18788332015.

51023388781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50335166025 + 688222756 = 224355^2 + 26234^2 .

It is a cyclic number.

It is not a de Polignac number, because 51023388781 - 2¹³ = 51023380589 is a prime.

It is a super-2 number, since 2×51023388781² (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 (51023388701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25511694390 + 25511694391.

It is an arithmetic number, because the mean of its divisors is an integer number (25511694391).

Almost surely, 2^51023388781 is an apocalyptic number.

It is an amenable number.

51023388781 is a deficient number, since it is larger than the sum of its proper divisors (1).

51023388781 is an equidigital number, since it uses as much as digits as its factorization.

51023388781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 322560, while the sum is 46.

The spelling of 51023388781 in words is "fifty-one billion, twenty-three million, three hundred eighty-eight thousand, seven hundred eighty-one".