51381088537 has 2 divisors, whose sum is σ = 51381088538. Its totient is φ = 51381088536.

The previous prime is 51381088511. The next prime is 51381088607. The reversal of 51381088537 is 73588018315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51168249616 + 212838921 = 226204^2 + 14589^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51381088537 is a prime.

It is not a weakly prime, because it can be changed into another prime (51381088237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25690544268 + 25690544269.

It is an arithmetic number, because the mean of its divisors is an integer number (25690544269).

Almost surely, 2^51381088537 is an apocalyptic number.

It is an amenable number.

51381088537 is a deficient number, since it is larger than the sum of its proper divisors (1).

51381088537 is an equidigital number, since it uses as much as digits as its factorization.

51381088537 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 806400, while the sum is 49.

The spelling of 51381088537 in words is "fifty-one billion, three hundred eighty-one million, eighty-eight thousand, five hundred thirty-seven".