811985023 has 2 divisors, whose sum is σ = 811985024. Its totient is φ = 811985022.

The previous prime is 811985021. The next prime is 811985063. The reversal of 811985023 is 320589118.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 811985023 - 2¹ = 811985021 is a prime.

Together with 811985021, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (811985021) 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, 405992511 + 405992512.

It is an arithmetic number, because the mean of its divisors is an integer number (405992512).

Almost surely, 2^811985023 is an apocalyptic number.

811985023 is a deficient number, since it is larger than the sum of its proper divisors (1).

811985023 is an equidigital number, since it uses as much as digits as its factorization.

811985023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 37.

The square root of 811985023 is about 28495.3509015067. The cubic root of 811985023 is about 932.9306031899.

The spelling of 811985023 in words is "eight hundred eleven million, nine hundred eighty-five thousand, twenty-three".