81892411 has 2 divisors, whose sum is σ = 81892412. Its totient is φ = 81892410.

The previous prime is 81892403. The next prime is 81892441. The reversal of 81892411 is 11429818.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81892411 - 2³ = 81892403 is a prime.

It is not a weakly prime, because it can be changed into another prime (81892441) 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, 40946205 + 40946206.

It is an arithmetic number, because the mean of its divisors is an integer number (40946206).

Almost surely, 2^81892411 is an apocalyptic number.

81892411 is a deficient number, since it is larger than the sum of its proper divisors (1).

81892411 is an equidigital number, since it uses as much as digits as its factorization.

81892411 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 34.

The square root of 81892411 is about 9049.4425795184. The cubic root of 81892411 is about 434.2580579285.

The spelling of 81892411 in words is "eighty-one million, eight hundred ninety-two thousand, four hundred eleven".