8391651812 has 12 divisors (see below), whose sum is σ = 14746327596. Its totient is φ = 4178415360.

The previous prime is 8391651811. The next prime is 8391651887. The reversal of 8391651812 is 2181561938.

It can be written as a sum of positive squares in 2 ways, for example, as 4216424356 + 4175227456 = 64934^2 + 64616^2 .

It is not an unprimeable number, because it can be changed into a prime (8391651811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4351553 + ... + 4353480.

It is an arithmetic number, because the mean of its divisors is an integer number (1228860633).

Almost surely, 2^8391651812 is an apocalyptic number.

It is an amenable number.

8391651812 is a deficient number, since it is larger than the sum of its proper divisors (6354675784).

8391651812 is a wasteful number, since it uses less digits than its factorization.

8391651812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8705278 (or 8705276 counting only the distinct ones).

The product of its digits is 103680, while the sum is 44.

The square root of 8391651812 is about 91605.9594786278. The cubic root of 8391651812 is about 2032.1190723335.

The spelling of 8391651812 in words is "eight billion, three hundred ninety-one million, six hundred fifty-one thousand, eight hundred twelve".