11220551 has 2 divisors, whose sum is σ = 11220552. Its totient is φ = 11220550.

The previous prime is 11220541. The next prime is 11220553. The reversal of 11220551 is 15502211.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11220551 - 2⁶ = 11220487 is a prime.

It is a Sophie Germain prime.

Together with 11220553, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11220553) 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, 5610275 + 5610276.

It is an arithmetic number, because the mean of its divisors is an integer number (5610276).

Almost surely, 2^11220551 is an apocalyptic number.

11220551 is a deficient number, since it is larger than the sum of its proper divisors (1).

11220551 is an equidigital number, since it uses as much as digits as its factorization.

11220551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 11220551 is about 3349.7090918466. The cubic root of 11220551 is about 223.8745510896.

Adding to 11220551 its reverse (15502211), we get a palindrome (26722762).

The spelling of 11220551 in words is "eleven million, two hundred twenty thousand, five hundred fifty-one".