51217094989 has 2 divisors, whose sum is σ = 51217094990. Its totient is φ = 51217094988.

The previous prime is 51217094987. The next prime is 51217095043. The reversal of 51217094989 is 98949071215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47727830089 + 3489264900 = 218467^2 + 59070^2 .

It is a cyclic number.

It is not a de Polignac number, because 51217094989 - 2¹ = 51217094987 is a prime.

It is a super-2 number, since 2×51217094989² (a number of 22 digits) contains 22 as substring.

Together with 51217094987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51217094987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25608547494 + 25608547495.

It is an arithmetic number, because the mean of its divisors is an integer number (25608547495).

Almost surely, 2^51217094989 is an apocalyptic number.

It is an amenable number.

51217094989 is a deficient number, since it is larger than the sum of its proper divisors (1).

51217094989 is an equidigital number, since it uses as much as digits as its factorization.

51217094989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1632960, while the sum is 55.

The spelling of 51217094989 in words is "fifty-one billion, two hundred seventeen million, ninety-four thousand, nine hundred eighty-nine".