81414923 has 2 divisors, whose sum is σ = 81414924. Its totient is φ = 81414922.

The previous prime is 81414901. The next prime is 81414947. The reversal of 81414923 is 32941418.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81414923 - 2⁶ = 81414859 is a prime.

It is a Sophie Germain prime.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 81414923.

It is not a weakly prime, because it can be changed into another prime (81414623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40707461 + 40707462.

It is an arithmetic number, because the mean of its divisors is an integer number (40707462).

Almost surely, 2^81414923 is an apocalyptic number.

81414923 is a deficient number, since it is larger than the sum of its proper divisors (1).

81414923 is an equidigital number, since it uses as much as digits as its factorization.

81414923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 32.

The square root of 81414923 is about 9023.0218330668. The cubic root of 81414923 is about 433.4124064117.

The spelling of 81414923 in words is "eighty-one million, four hundred fourteen thousand, nine hundred twenty-three".