8019521 has 4 divisors (see below), whose sum is σ = 8132544. Its totient is φ = 7906500.

The previous prime is 8019511. The next prime is 8019541. The reversal of 8019521 is 1259108.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8019521 - 2¹⁰ = 8018497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8019511) 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, 56405 + ... + 56546.

It is an arithmetic number, because the mean of its divisors is an integer number (2033136).

Almost surely, 2^8019521 is an apocalyptic number.

It is an amenable number.

8019521 is a deficient number, since it is larger than the sum of its proper divisors (113023).

8019521 is a wasteful number, since it uses less digits than its factorization.

8019521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113022.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 8019521 is about 2831.8758800484. The cubic root of 8019521 is about 200.1625428633.

The spelling of 8019521 in words is "eight million, nineteen thousand, five hundred twenty-one".