30686818931 has 2 divisors, whose sum is σ = 30686818932. Its totient is φ = 30686818930.

The previous prime is 30686818913. The next prime is 30686818963. The reversal of 30686818931 is 13981868603.

It is a happy number.

Together with previous prime (30686818913) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 30686818931 - 2¹⁴ = 30686802547 is a prime.

It is a super-2 number, since 2×30686818931² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (30686808931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15343409465 + 15343409466.

It is an arithmetic number, because the mean of its divisors is an integer number (15343409466).

Almost surely, 2^30686818931 is an apocalyptic number.

30686818931 is a deficient number, since it is larger than the sum of its proper divisors (1).

30686818931 is an equidigital number, since it uses as much as digits as its factorization.

30686818931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1492992, while the sum is 53.

The spelling of 30686818931 in words is "thirty billion, six hundred eighty-six million, eight hundred eighteen thousand, nine hundred thirty-one".