23981311 has 2 divisors, whose sum is σ = 23981312. Its totient is φ = 23981310.

The previous prime is 23981297. The next prime is 23981323. The reversal of 23981311 is 11318932.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23981311 - 2⁷ = 23981183 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23981311.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23981381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11990655 + 11990656.

It is an arithmetic number, because the mean of its divisors is an integer number (11990656).

Almost surely, 2^23981311 is an apocalyptic number.

23981311 is a deficient number, since it is larger than the sum of its proper divisors (1).

23981311 is an equidigital number, since it uses as much as digits as its factorization.

23981311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 28.

The square root of 23981311 is about 4897.0716760121. The cubic root of 23981311 is about 288.3750218344.

It can be divided in two parts, 2398 and 1311, that multiplied together give a triangular number (3143778 = T₂₅₀₇).

The spelling of 23981311 in words is "twenty-three million, nine hundred eighty-one thousand, three hundred eleven".