7457521 has 4 divisors (see below), whose sum is σ = 7552000. Its totient is φ = 7363044.

The previous prime is 7457503. The next prime is 7457561. The reversal of 7457521 is 1257547.

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 7457521 - 2¹³ = 7449329 is a prime.

It is a super-2 number, since 2×7457521² = 111229238930882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7457561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47121 + ... + 47278.

It is an arithmetic number, because the mean of its divisors is an integer number (1888000).

Almost surely, 2^7457521 is an apocalyptic number.

It is an amenable number.

7457521 is a deficient number, since it is larger than the sum of its proper divisors (94479).

7457521 is an equidigital number, since it uses as much as digits as its factorization.

7457521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94478.

The product of its digits is 9800, while the sum is 31.

The square root of 7457521 is about 2730.8462058490. The cubic root of 7457521 is about 195.3731273461.

The spelling of 7457521 in words is "seven million, four hundred fifty-seven thousand, five hundred twenty-one".