81848911 has 2 divisors, whose sum is σ = 81848912. Its totient is φ = 81848910.

The previous prime is 81848867. The next prime is 81848917. The reversal of 81848911 is 11984818.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81848911 - 2¹³ = 81840719 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81848917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40924455 + 40924456.

It is an arithmetic number, because the mean of its divisors is an integer number (40924456).

Almost surely, 2^81848911 is an apocalyptic number.

81848911 is a deficient number, since it is larger than the sum of its proper divisors (1).

81848911 is an equidigital number, since it uses as much as digits as its factorization.

81848911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18432, while the sum is 40.

The square root of 81848911 is about 9047.0387973082. The cubic root of 81848911 is about 434.1811538906.

It can be divided in two parts, 818 and 48911, that added together give a square (49729 = 223²).

The spelling of 81848911 in words is "eighty-one million, eight hundred forty-eight thousand, nine hundred eleven".