51243603937 has 2 divisors, whose sum is σ = 51243603938. Its totient is φ = 51243603936.

The previous prime is 51243603923. The next prime is 51243603947. The reversal of 51243603937 is 73930634215.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40495927696 + 10747676241 = 201236^2 + 103671^2 .

It is a cyclic number.

It is not a de Polignac number, because 51243603937 - 2²³ = 51235215329 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51243603893 and 51243603902.

It is not a weakly prime, because it can be changed into another prime (51243603947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25621801968 + 25621801969.

It is an arithmetic number, because the mean of its divisors is an integer number (25621801969).

Almost surely, 2^51243603937 is an apocalyptic number.

It is an amenable number.

51243603937 is a deficient number, since it is larger than the sum of its proper divisors (1).

51243603937 is an equidigital number, since it uses as much as digits as its factorization.

51243603937 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 408240, while the sum is 43.

The spelling of 51243603937 in words is "fifty-one billion, two hundred forty-three million, six hundred three thousand, nine hundred thirty-seven".