23981647 has 2 divisors, whose sum is σ = 23981648. Its totient is φ = 23981646.

The previous prime is 23981641. The next prime is 23981687. The reversal of 23981647 is 74618932.

It is an a-pointer prime, because the next prime (23981687) can be obtained adding 23981647 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 23981647 - 2⁷ = 23981519 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 (23981641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11990823 + 11990824.

It is an arithmetic number, because the mean of its divisors is an integer number (11990824).

Almost surely, 2^23981647 is an apocalyptic number.

23981647 is a deficient number, since it is larger than the sum of its proper divisors (1).

23981647 is an equidigital number, since it uses as much as digits as its factorization.

23981647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 40.

The square root of 23981647 is about 4897.1059821082. The cubic root of 23981647 is about 288.3763686270.

The spelling of 23981647 in words is "twenty-three million, nine hundred eighty-one thousand, six hundred forty-seven".