11220531 has 8 divisors (see below), whose sum is σ = 17097984. Its totient is φ = 6411720.

The previous prime is 11220491. The next prime is 11220533. The reversal of 11220531 is 13502211.

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

It is not a de Polignac number, because 11220531 - 2⁶ = 11220467 is a prime.

It is a super-2 number, since 2×11220531² = 251800631843922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11220531.

It is not an unprimeable number, because it can be changed into a prime (11220533) 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 7 ways as a sum of consecutive naturals, for example, 267135 + ... + 267176.

It is an arithmetic number, because the mean of its divisors is an integer number (2137248).

Almost surely, 2^11220531 is an apocalyptic number.

11220531 is a deficient number, since it is larger than the sum of its proper divisors (5877453).

11220531 is an equidigital number, since it uses as much as digits as its factorization.

11220531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534321.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 11220531 is about 3349.7061065114. The cubic root of 11220531 is about 223.8744180750.

Adding to 11220531 its reverse (13502211), we get a palindrome (24722742).

The spelling of 11220531 in words is "eleven million, two hundred twenty thousand, five hundred thirty-one".