81196847 has 2 divisors, whose sum is σ = 81196848. Its totient is φ = 81196846.

The previous prime is 81196799. The next prime is 81196849. The reversal of 81196847 is 74869118.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81196847 - 2¹⁸ = 80934703 is a prime.

Together with 81196849, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 81196798 and 81196807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81196849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40598423 + 40598424.

It is an arithmetic number, because the mean of its divisors is an integer number (40598424).

Almost surely, 2^81196847 is an apocalyptic number.

81196847 is a deficient number, since it is larger than the sum of its proper divisors (1).

81196847 is an equidigital number, since it uses as much as digits as its factorization.

81196847 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 44.

The square root of 81196847 is about 9010.9293083455. The cubic root of 81196847 is about 433.0250844629.

The spelling of 81196847 in words is "eighty-one million, one hundred ninety-six thousand, eight hundred forty-seven".