51981264037 has 2 divisors, whose sum is σ = 51981264038. Its totient is φ = 51981264036.

The previous prime is 51981263993. The next prime is 51981264047. The reversal of 51981264037 is 73046218915.

It is a Cunningham number, because it is equal to 227994²+1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51981264036 + 1 = 227994^2 + 1^2 .

It is a cyclic number.

It is not a de Polignac number, because 51981264037 - 2¹¹ = 51981261989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51981264047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25990632018 + 25990632019.

It is an arithmetic number, because the mean of its divisors is an integer number (25990632019).

It is a 2-persistent number, because it is pandigital, and so is 2⋅51981264037 = 103962528074, but 3⋅51981264037 = 155943792111 is not.

Almost surely, 2^51981264037 is an apocalyptic number.

It is an amenable number.

51981264037 is a deficient number, since it is larger than the sum of its proper divisors (1).

51981264037 is an equidigital number, since it uses as much as digits as its factorization.

51981264037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 46.

The spelling of 51981264037 in words is "fifty-one billion, nine hundred eighty-one million, two hundred sixty-four thousand, thirty-seven".