7221529 has 8 divisors (see below), whose sum is σ = 8307008. Its totient is φ = 6149520.

The previous prime is 7221523. The next prime is 7221547. The reversal of 7221529 is 9251227.

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 7221529 - 2⁹ = 7221017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7221497 and 7221506.

It is not an unprimeable number, because it can be changed into a prime (7221523) 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, 2187 + ... + 4384.

It is an arithmetic number, because the mean of its divisors is an integer number (1038376).

Almost surely, 2^7221529 is an apocalyptic number.

It is an amenable number.

7221529 is a deficient number, since it is larger than the sum of its proper divisors (1085479).

7221529 is a wasteful number, since it uses less digits than its factorization.

7221529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6735.

The product of its digits is 2520, while the sum is 28.

The square root of 7221529 is about 2687.2902708863. The cubic root of 7221529 is about 193.2901485657.

It can be divided in two parts, 7221 and 529, that added together give a triangular number (7750 = T₁₂₄).

The spelling of 7221529 in words is "seven million, two hundred twenty-one thousand, five hundred twenty-nine".