23218147 has 2 divisors, whose sum is σ = 23218148. Its totient is φ = 23218146.

The previous prime is 23218127. The next prime is 23218159. The reversal of 23218147 is 74181232.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23218147 - 2¹⁹ = 22693859 is a prime.

It is a super-2 number, since 2×23218147² = 1078164700227218, which contains 22 as substring.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is equal to p_1461079 and since 23218147 and 1461079 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (23218127) 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, 11609073 + 11609074.

It is an arithmetic number, because the mean of its divisors is an integer number (11609074).

Almost surely, 2^23218147 is an apocalyptic number.

23218147 is a deficient number, since it is larger than the sum of its proper divisors (1).

23218147 is an equidigital number, since it uses as much as digits as its factorization.

23218147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 28.

The square root of 23218147 is about 4818.5212461916. The cubic root of 23218147 is about 285.2829732807.

Adding to 23218147 its reverse (74181232), we get a palindrome (97399379).

The spelling of 23218147 in words is "twenty-three million, two hundred eighteen thousand, one hundred forty-seven".