7047521 has 4 divisors (see below), whose sum is σ = 7589652. Its totient is φ = 6505392.

The previous prime is 7047487. The next prime is 7047539. The reversal of 7047521 is 1257407.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1257407 = 181 ⋅6947.

It can be written as a sum of positive squares in 2 ways, for example, as 2890000 + 4157521 = 1700^2 + 2039^2 .

It is a cyclic number.

It is not a de Polignac number, because 7047521 - 2⁶ = 7047457 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7047541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 271046 + ... + 271071.

It is an arithmetic number, because the mean of its divisors is an integer number (1897413).

Almost surely, 2^7047521 is an apocalyptic number.

It is an amenable number.

7047521 is a deficient number, since it is larger than the sum of its proper divisors (542131).

7047521 is a wasteful number, since it uses less digits than its factorization.

7047521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542130.

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 7047521 is about 2654.7167457188. The cubic root of 7047521 is about 191.7250205014.

The spelling of 7047521 in words is "seven million, forty-seven thousand, five hundred twenty-one".