8123191020 has 144 divisors (see below), whose sum is σ = 29068935168. Its totient is φ = 1796826240.

The previous prime is 8123190983. The next prime is 8123191057. The reversal of 8123191020 is 201913218.

It is an interprime number because it is at equal distance from previous prime (8123190983) and next prime (8123191057).

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 64924 + ... + 143043.

Almost surely, 2^8123191020 is an apocalyptic number.

It is an amenable number.

8123191020 is an abundant number, since it is smaller than the sum of its proper divisors (20945744148).

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

8123191020 is a wasteful number, since it uses less digits than its factorization.

8123191020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208020 (or 208015 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 8123191020 is about 90128.7469124030. The cubic root of 8123191020 is about 2010.2136700157.

The spelling of 8123191020 in words is "eight billion, one hundred twenty-three million, one hundred ninety-one thousand, twenty".