7431521 has 2 divisors, whose sum is σ = 7431522. Its totient is φ = 7431520.

The previous prime is 7431517. The next prime is 7431551. The reversal of 7431521 is 1251347.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6948496 + 483025 = 2636^2 + 695^2 .

It is a cyclic number.

It is not a de Polignac number, because 7431521 - 2² = 7431517 is a prime.

It is a Chen prime.

It is equal to p₅₀₃₉₆₀ and since 7431521 and 503960 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (7431551) 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 as a sum of consecutive naturals, namely, 3715760 + 3715761.

It is an arithmetic number, because the mean of its divisors is an integer number (3715761).

Almost surely, 2^7431521 is an apocalyptic number.

It is an amenable number.

7431521 is a deficient number, since it is larger than the sum of its proper divisors (1).

7431521 is an equidigital number, since it uses as much as digits as its factorization.

7431521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 840, while the sum is 23.

The square root of 7431521 is about 2726.0816202014. The cubic root of 7431521 is about 195.1458124835.

Adding to 7431521 its reverse (1251347), we get a palindrome (8682868).

The spelling of 7431521 in words is "seven million, four hundred thirty-one thousand, five hundred twenty-one".