51973394989 has 2 divisors, whose sum is σ = 51973394990. Its totient is φ = 51973394988.

The previous prime is 51973394953. The next prime is 51973395091. The reversal of 51973394989 is 98949337915.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28849022500 + 23124372489 = 169850^2 + 152067^2 .

It is a cyclic number.

It is not a de Polignac number, because 51973394989 - 2⁷ = 51973394861 is a prime.

It is a super-2 number, since 2×51973394989² (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 (51973394909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25986697494 + 25986697495.

It is an arithmetic number, because the mean of its divisors is an integer number (25986697495).

Almost surely, 2^51973394989 is an apocalyptic number.

It is an amenable number.

51973394989 is a deficient number, since it is larger than the sum of its proper divisors (1).

51973394989 is an equidigital number, since it uses as much as digits as its factorization.

51973394989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 66134880, while the sum is 67.

The spelling of 51973394989 in words is "fifty-one billion, nine hundred seventy-three million, three hundred ninety-four thousand, nine hundred eighty-nine".