13220551 has 2 divisors, whose sum is σ = 13220552. Its totient is φ = 13220550.

The previous prime is 13220533. The next prime is 13220567. The reversal of 13220551 is 15502231.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13220551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13220521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6610275 + 6610276.

It is an arithmetic number, because the mean of its divisors is an integer number (6610276).

Almost surely, 2^13220551 is an apocalyptic number.

13220551 is a deficient number, since it is larger than the sum of its proper divisors (1).

13220551 is an equidigital number, since it uses as much as digits as its factorization.

13220551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 13220551 is about 3636.0075632485. The cubic root of 13220551 is about 236.4557350479.

Adding to 13220551 its reverse (15502231), we get a palindrome (28722782).

The spelling of 13220551 in words is "thirteen million, two hundred twenty thousand, five hundred fifty-one".