23165551 has 2 divisors, whose sum is σ = 23165552. Its totient is φ = 23165550.

The previous prime is 23165537. The next prime is 23165557. The reversal of 23165551 is 15556132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23165551 - 2⁷ = 23165423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23165557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11582775 + 11582776.

It is an arithmetic number, because the mean of its divisors is an integer number (11582776).

Almost surely, 2^23165551 is an apocalyptic number.

23165551 is a deficient number, since it is larger than the sum of its proper divisors (1).

23165551 is an equidigital number, since it uses as much as digits as its factorization.

23165551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4500, while the sum is 28.

The square root of 23165551 is about 4813.0604608710. The cubic root of 23165551 is about 285.0673935216.

It can be divided in two parts, 23165 and 551, that added together give a square (23716 = 154²).

The spelling of 23165551 in words is "twenty-three million, one hundred sixty-five thousand, five hundred fifty-one".