9812311640 has 32 divisors (see below), whose sum is σ = 22082490000. Its totient is φ = 3924073344.

The previous prime is 9812311637. The next prime is 9812311643. The reversal of 9812311640 is 461132189.

It is an interprime number because it is at equal distance from previous prime (9812311637) and next prime (9812311643).

It is a self number, because there is not a number n which added to its sum of digits gives 9812311640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9812311643) 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 in 7 ways as a sum of consecutive naturals, for example, 179906 + ... + 228014.

Almost surely, 2^9812311640 is an apocalyptic number.

It is an amenable number.

9812311640 is an abundant number, since it is smaller than the sum of its proper divisors (12270178360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9812311640 is a wasteful number, since it uses less digits than its factorization.

9812311640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53219 (or 53215 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 9812311640 is about 99057.1130207215. The cubic root of 9812311640 is about 2140.8707290225.

The spelling of 9812311640 in words is "nine billion, eight hundred twelve million, three hundred eleven thousand, six hundred forty".