23981329 has 2 divisors, whose sum is σ = 23981330. Its totient is φ = 23981328.

The previous prime is 23981323. The next prime is 23981359. The reversal of 23981329 is 92318932.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20566225 + 3415104 = 4535^2 + 1848^2 .

It is a cyclic number.

It is not a de Polignac number, because 23981329 - 2⁵ = 23981297 is a prime.

It is not a weakly prime, because it can be changed into another prime (23981323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11990664 + 11990665.

It is an arithmetic number, because the mean of its divisors is an integer number (11990665).

Almost surely, 2^23981329 is an apocalyptic number.

It is an amenable number.

23981329 is a deficient number, since it is larger than the sum of its proper divisors (1).

23981329 is an equidigital number, since it uses as much as digits as its factorization.

23981329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 37.

The square root of 23981329 is about 4897.0735138448. The cubic root of 23981329 is about 288.3750939844.

It can be divided in two parts, 23981 and 329, that added together give a triangular number (24310 = T₂₂₀).

The spelling of 23981329 in words is "twenty-three million, nine hundred eighty-one thousand, three hundred twenty-nine".