7289521 has 4 divisors (see below), whose sum is σ = 7673200. Its totient is φ = 6905844.

The previous prime is 7289519. The next prime is 7289531. The reversal of 7289521 is 1259827.

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 7289521 - 2¹ = 7289519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7289531) 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, 191811 + ... + 191848.

It is an arithmetic number, because the mean of its divisors is an integer number (1918300).

Almost surely, 2^7289521 is an apocalyptic number.

It is an amenable number.

7289521 is a deficient number, since it is larger than the sum of its proper divisors (383679).

7289521 is a wasteful number, since it uses less digits than its factorization.

7289521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383678.

The product of its digits is 10080, while the sum is 34.

The square root of 7289521 is about 2699.9112948391. The cubic root of 7289521 is about 193.8948752024.

The spelling of 7289521 in words is "seven million, two hundred eighty-nine thousand, five hundred twenty-one".