8121699035 has 4 divisors (see below), whose sum is σ = 9746038848. Its totient is φ = 6497359224.

The previous prime is 8121699013. The next prime is 8121699067. The reversal of 8121699035 is 5309961218.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5309961218 = 2 ⋅2654980609.

It is a cyclic number.

It is not a de Polignac number, because 8121699035 - 2¹⁸ = 8121436891 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 812169899 + ... + 812169908.

It is an arithmetic number, because the mean of its divisors is an integer number (2436509712).

Almost surely, 2^8121699035 is an apocalyptic number.

8121699035 is a deficient number, since it is larger than the sum of its proper divisors (1624339813).

8121699035 is a wasteful number, since it uses less digits than its factorization.

8121699035 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1624339812.

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 8121699035 is about 90120.4695671300. The cubic root of 8121699035 is about 2010.0905906218.

The spelling of 8121699035 in words is "eight billion, one hundred twenty-one million, six hundred ninety-nine thousand, thirty-five".