7220531 has 2 divisors, whose sum is σ = 7220532. Its totient is φ = 7220530.

The previous prime is 7220519. The next prime is 7220557. The reversal of 7220531 is 1350227.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7220531 - 2¹⁰ = 7219507 is a prime.

It is a super-2 number, since 2×7220531² = 104272135843922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7220581) 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 as a sum of consecutive naturals, namely, 3610265 + 3610266.

It is an arithmetic number, because the mean of its divisors is an integer number (3610266).

Almost surely, 2^7220531 is an apocalyptic number.

7220531 is a deficient number, since it is larger than the sum of its proper divisors (1).

7220531 is an equidigital number, since it uses as much as digits as its factorization.

7220531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 7220531 is about 2687.1045755608. The cubic root of 7220531 is about 193.2812440592.

Adding to 7220531 its reverse (1350227), we get a palindrome (8570758).

The spelling of 7220531 in words is "seven million, two hundred twenty thousand, five hundred thirty-one".