11220525 has 36 divisors (see below), whose sum is σ = 20852832. Its totient is φ = 5981040.

The previous prime is 11220491. The next prime is 11220533. The reversal of 11220525 is 52502211.

11220525 = 449² + 450² + ... + 498².

It is not a de Polignac number, because 11220525 - 2⁷ = 11220397 is a prime.

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 11220498 and 11220507.

It is a congruent number.

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 5152 + ... + 6998.

Almost surely, 2^11220525 is an apocalyptic number.

11220525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11220525 is a deficient number, since it is larger than the sum of its proper divisors (9632307).

11220525 is an equidigital number, since it uses as much as digits as its factorization.

11220525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1872 (or 1855 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 11220525 is about 3349.7052109104. The cubic root of 11220525 is about 223.8743781705.

Adding to 11220525 its reverse (52502211), we get a palindrome (63722736).

The spelling of 11220525 in words is "eleven million, two hundred twenty thousand, five hundred twenty-five".