7312521 has 4 divisors (see below), whose sum is σ = 9750032. Its totient is φ = 4875012.

The previous prime is 7312517. The next prime is 7312531. The reversal of 7312521 is 1252137.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1252137 = 3 ⋅417379.

It is not a de Polignac number, because 7312521 - 2² = 7312517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7312531) 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, 1218751 + ... + 1218756.

It is an arithmetic number, because the mean of its divisors is an integer number (2437508).

Almost surely, 2^7312521 is an apocalyptic number.

It is an amenable number.

7312521 is a deficient number, since it is larger than the sum of its proper divisors (2437511).

7312521 is a wasteful number, since it uses less digits than its factorization.

7312521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2437510.

The product of its digits is 420, while the sum is 21.

The square root of 7312521 is about 2704.1673394966. The cubic root of 7312521 is about 194.0985877198.

Adding to 7312521 its reverse (1252137), we get a palindrome (8564658).

The spelling of 7312521 in words is "seven million, three hundred twelve thousand, five hundred twenty-one".