23220551 has 2 divisors, whose sum is σ = 23220552. Its totient is φ = 23220550.

The previous prime is 23220529. The next prime is 23220563. The reversal of 23220551 is 15502232.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23220551 - 2¹⁸ = 22958407 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23225551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11610275 + 11610276.

It is an arithmetic number, because the mean of its divisors is an integer number (11610276).

Almost surely, 2^23220551 is an apocalyptic number.

23220551 is a deficient number, since it is larger than the sum of its proper divisors (1).

23220551 is an equidigital number, since it uses as much as digits as its factorization.

23220551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 23220551 is about 4818.7706938596. The cubic root of 23220551 is about 285.2928189788.

Adding to 23220551 its reverse (15502232), we get a palindrome (38722783).

The spelling of 23220551 in words is "twenty-three million, two hundred twenty thousand, five hundred fifty-one".