30911640912 has 60 divisors (see below), whose sum is σ = 87481716660. Its totient is φ = 10188102144.

The previous prime is 30911640887. The next prime is 30911640919. The reversal of 30911640912 is 21904611903.

It is a happy number.

30911640912 is a `hidden beast` number, since 3 + 0 + 9 + 1 + 1 + 640 + 9 + 1 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 7011717696 + 23899923216 = 83736^2 + 154596^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30911640919) 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 in 11 ways as a sum of consecutive naturals, for example, 1193163 + ... + 1218794.

It is an arithmetic number, because the mean of its divisors is an integer number (1458028611).

Almost surely, 2^30911640912 is an apocalyptic number.

It is an amenable number.

30911640912 is an abundant number, since it is smaller than the sum of its proper divisors (56570075748).

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

30911640912 is a wasteful number, since it uses less digits than its factorization.

30911640912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2412060 (or 2412051 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The spelling of 30911640912 in words is "thirty billion, nine hundred eleven million, six hundred forty thousand, nine hundred twelve".