8121719 has 4 divisors (see below), whose sum is σ = 8163144. Its totient is φ = 8080296.

The previous prime is 8121709. The next prime is 8121727. The reversal of 8121719 is 9171218.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8121719 is a prime.

It is a super-2 number, since 2×8121719² = 131924639029922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8121691 and 8121700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8121709) 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, 20417 + ... + 20810.

It is an arithmetic number, because the mean of its divisors is an integer number (2040786).

Almost surely, 2^8121719 is an apocalyptic number.

8121719 is a deficient number, since it is larger than the sum of its proper divisors (41425).

8121719 is a wasteful number, since it uses less digits than its factorization.

8121719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41424.

The product of its digits is 1008, while the sum is 29.

The square root of 8121719 is about 2849.8629791623. The cubic root of 8121719 is about 201.0092237708.

The spelling of 8121719 in words is "eight million, one hundred twenty-one thousand, seven hundred nineteen".