31207385513 has 2 divisors, whose sum is σ = 31207385514. Its totient is φ = 31207385512.

The previous prime is 31207385497. The next prime is 31207385623. The reversal of 31207385513 is 31558370213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20792774809 + 10414610704 = 144197^2 + 102052^2 .

It is an emirp because it is prime and its reverse (31558370213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31207385513 - 2⁴ = 31207385497 is a prime.

It is not a weakly prime, because it can be changed into another prime (31206385513) 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, 15603692756 + 15603692757.

It is an arithmetic number, because the mean of its divisors is an integer number (15603692757).

Almost surely, 2^31207385513 is an apocalyptic number.

It is an amenable number.

31207385513 is a deficient number, since it is larger than the sum of its proper divisors (1).

31207385513 is an equidigital number, since it uses as much as digits as its factorization.

31207385513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75600, while the sum is 38.

The spelling of 31207385513 in words is "thirty-one billion, two hundred seven million, three hundred eighty-five thousand, five hundred thirteen".