7315521 has 4 divisors (see below), whose sum is σ = 9754032. Its totient is φ = 4877012.

The previous prime is 7315499. The next prime is 7315543. The reversal of 7315521 is 1255137.

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 an interprime number because it is at equal distance from previous prime (7315499) and next prime (7315543).

It is a cyclic number.

It is not a de Polignac number, because 7315521 - 2⁵ = 7315489 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7315491 and 7315500.

It is not an unprimeable number, because it can be changed into a prime (7315571) 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, 1219251 + ... + 1219256.

It is an arithmetic number, because the mean of its divisors is an integer number (2438508).

Almost surely, 2^7315521 is an apocalyptic number.

It is an amenable number.

7315521 is a deficient number, since it is larger than the sum of its proper divisors (2438511).

7315521 is a wasteful number, since it uses less digits than its factorization.

7315521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2438510.

The product of its digits is 1050, while the sum is 24.

The square root of 7315521 is about 2704.7219820159. The cubic root of 7315521 is about 194.1251274112.

The spelling of 7315521 in words is "seven million, three hundred fifteen thousand, five hundred twenty-one".