11981023 has 2 divisors, whose sum is σ = 11981024. Its totient is φ = 11981022.

The previous prime is 11981017. The next prime is 11981027. The reversal of 11981023 is 32018911.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11981023 - 2⁹ = 11980511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11981027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5990511 + 5990512.

It is an arithmetic number, because the mean of its divisors is an integer number (5990512).

Almost surely, 2^11981023 is an apocalyptic number.

11981023 is a deficient number, since it is larger than the sum of its proper divisors (1).

11981023 is an equidigital number, since it uses as much as digits as its factorization.

11981023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 11981023 is about 3461.3614373538. The cubic root of 11981023 is about 228.8221001583.

Adding to 11981023 its reverse (32018911), we get a palindrome (43999934).

The spelling of 11981023 in words is "eleven million, nine hundred eighty-one thousand, twenty-three".