8013521699 has 4 divisors (see below), whose sum is σ = 8092863600. Its totient is φ = 7934179800.

The previous prime is 8013521689. The next prime is 8013521707. The reversal of 8013521699 is 9961253108.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 8013521699 - 2²⁰ = 8012473123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8013521629) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 39670799 + ... + 39671000.

It is an arithmetic number, because the mean of its divisors is an integer number (2023215900).

Almost surely, 2^8013521699 is an apocalyptic number.

8013521699 is a deficient number, since it is larger than the sum of its proper divisors (79341901).

8013521699 is a wasteful number, since it uses less digits than its factorization.

8013521699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79341900.

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

The square root of 8013521699 is about 89518.2757820994. The cubic root of 8013521699 is about 2001.1261739970.

The spelling of 8013521699 in words is "eight billion, thirteen million, five hundred twenty-one thousand, six hundred ninety-nine".