31650078613 has 2 divisors, whose sum is σ = 31650078614. Its totient is φ = 31650078612.

The previous prime is 31650078557. The next prime is 31650078631. The reversal of 31650078613 is 31687005613.

It is a happy number.

Together with next prime (31650078631) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30933070884 + 717007729 = 175878^2 + 26777^2 .

It is an emirp because it is prime and its reverse (31687005613) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31650078613 - 2²¹ = 31647981461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31650078113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15825039306 + 15825039307.

It is an arithmetic number, because the mean of its divisors is an integer number (15825039307).

Almost surely, 2^31650078613 is an apocalyptic number.

It is an amenable number.

31650078613 is a deficient number, since it is larger than the sum of its proper divisors (1).

31650078613 is an equidigital number, since it uses as much as digits as its factorization.

31650078613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 40.

The spelling of 31650078613 in words is "thirty-one billion, six hundred fifty million, seventy-eight thousand, six hundred thirteen".