7008521 has 8 divisors (see below), whose sum is σ = 7582344. Its totient is φ = 6439680.

The previous prime is 7008493. The next prime is 7008523. The reversal of 7008521 is 1258007.

It can be written as a sum of positive squares in 4 ways, for example, as 1537600 + 5470921 = 1240^2 + 2339^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 7008521 - 2⁶ = 7008457 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7008523) 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 7 ways as a sum of consecutive naturals, for example, 2015 + ... + 4251.

It is an arithmetic number, because the mean of its divisors is an integer number (947793).

Almost surely, 2^7008521 is an apocalyptic number.

It is an amenable number.

7008521 is a deficient number, since it is larger than the sum of its proper divisors (573823).

7008521 is a wasteful number, since it uses less digits than its factorization.

7008521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2491.

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 7008521 is about 2647.3611389457. The cubic root of 7008521 is about 191.3707062635.

The spelling of 7008521 in words is "seven million, eight thousand, five hundred twenty-one".