8121294918 has 24 divisors (see below), whose sum is σ = 19195788456. Its totient is φ = 2460998400.

The previous prime is 8121294899. The next prime is 8121294931. The reversal of 8121294918 is 8194921218.

It is a super-2 number, since 2×8121294918² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20508123 + ... + 20508518.

It is an arithmetic number, because the mean of its divisors is an integer number (799824519).

Almost surely, 2^8121294918 is an apocalyptic number.

8121294918 is an abundant number, since it is smaller than the sum of its proper divisors (11074493538).

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

8121294918 is a wasteful number, since it uses less digits than its factorization.

8121294918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41016660 (or 41016657 counting only the distinct ones).

The product of its digits is 82944, while the sum is 45.

The square root of 8121294918 is about 90118.2274459501. The cubic root of 8121294918 is about 2010.0572509126.

The spelling of 8121294918 in words is "eight billion, one hundred twenty-one million, two hundred ninety-four thousand, nine hundred eighteen".