31860786653 has 2 divisors, whose sum is σ = 31860786654. Its totient is φ = 31860786652.

The previous prime is 31860786649. The next prime is 31860786697. The reversal of 31860786653 is 35668706813.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23609244409 + 8251542244 = 153653^2 + 90838^2 .

It is a cyclic number.

It is not a de Polignac number, because 31860786653 - 2² = 31860786649 is a prime.

It is a super-2 number, since 2×31860786653² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31860786595 and 31860786604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31860786953) 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, 15930393326 + 15930393327.

It is an arithmetic number, because the mean of its divisors is an integer number (15930393327).

Almost surely, 2^31860786653 is an apocalyptic number.

It is an amenable number.

31860786653 is a deficient number, since it is larger than the sum of its proper divisors (1).

31860786653 is an equidigital number, since it uses as much as digits as its factorization.

31860786653 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4354560, while the sum is 53.

The spelling of 31860786653 in words is "thirty-one billion, eight hundred sixty million, seven hundred eighty-six thousand, six hundred fifty-three".