7242521 has 8 divisors (see below), whose sum is σ = 8508864. Its totient is φ = 6077520.

The previous prime is 7242511. The next prime is 7242523. The reversal of 7242521 is 1252427.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 7242521 - 2⁶ = 7242457 is a prime.

It is a super-2 number, since 2×7242521² = 104908220870882, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7242523) 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, 25181 + ... + 25466.

It is an arithmetic number, because the mean of its divisors is an integer number (1063608).

Almost surely, 2^7242521 is an apocalyptic number.

It is an amenable number.

7242521 is a deficient number, since it is larger than the sum of its proper divisors (1266343).

7242521 is a wasteful number, since it uses less digits than its factorization.

7242521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50671.

The product of its digits is 1120, while the sum is 23.

The square root of 7242521 is about 2691.1932297775. The cubic root of 7242521 is about 193.4772567509.

Adding to 7242521 its reverse (1252427), we get a palindrome (8494948).

The spelling of 7242521 in words is "seven million, two hundred forty-two thousand, five hundred twenty-one".