51510631213 has 2 divisors, whose sum is σ = 51510631214. Its totient is φ = 51510631212.

The previous prime is 51510631199. The next prime is 51510631223. The reversal of 51510631213 is 31213601515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45172401444 + 6338229769 = 212538^2 + 79613^2 .

It is a cyclic number.

It is not a de Polignac number, because 51510631213 - 2⁹ = 51510630701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51510631223) 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, 25755315606 + 25755315607.

It is an arithmetic number, because the mean of its divisors is an integer number (25755315607).

Almost surely, 2^51510631213 is an apocalyptic number.

It is an amenable number.

51510631213 is a deficient number, since it is larger than the sum of its proper divisors (1).

51510631213 is an equidigital number, since it uses as much as digits as its factorization.

51510631213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2700, while the sum is 28.

The spelling of 51510631213 in words is "fifty-one billion, five hundred ten million, six hundred thirty-one thousand, two hundred thirteen".