51212534993 has 2 divisors, whose sum is σ = 51212534994. Its totient is φ = 51212534992.

The previous prime is 51212534977. The next prime is 51212535013. The reversal of 51212534993 is 39943521215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40093254289 + 11119280704 = 200233^2 + 105448^2 .

It is a cyclic number.

It is not a de Polignac number, because 51212534993 - 2⁴ = 51212534977 is a prime.

It is not a weakly prime, because it can be changed into another prime (51212534903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25606267496 + 25606267497.

It is an arithmetic number, because the mean of its divisors is an integer number (25606267497).

Almost surely, 2^51212534993 is an apocalyptic number.

It is an amenable number.

51212534993 is a deficient number, since it is larger than the sum of its proper divisors (1).

51212534993 is an equidigital number, since it uses as much as digits as its factorization.

51212534993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 291600, while the sum is 44.

The spelling of 51212534993 in words is "fifty-one billion, two hundred twelve million, five hundred thirty-four thousand, nine hundred ninety-three".