8121861119 has 4 divisors (see below), whose sum is σ = 8205591744. Its totient is φ = 8038130496.

The previous prime is 8121861079. The next prime is 8121861161. The reversal of 8121861119 is 9111681218.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9111681218 = 2 ⋅4555840609.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8121861119 is a prime.

It is a super-2 number, since 2×8121861119² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8121861169) 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, 41865167 + ... + 41865360.

It is an arithmetic number, because the mean of its divisors is an integer number (2051397936).

Almost surely, 2^8121861119 is an apocalyptic number.

8121861119 is a deficient number, since it is larger than the sum of its proper divisors (83730625).

8121861119 is an equidigital number, since it uses as much as digits as its factorization.

8121861119 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83730624.

The product of its digits is 6912, while the sum is 38.

The square root of 8121861119 is about 90121.3688256010. The cubic root of 8121861119 is about 2010.1039622638.

The spelling of 8121861119 in words is "eight billion, one hundred twenty-one million, eight hundred sixty-one thousand, one hundred nineteen".