81076847 has 2 divisors, whose sum is σ = 81076848. Its totient is φ = 81076846.

The previous prime is 81076829. The next prime is 81076867. The reversal of 81076847 is 74867018.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81076847 - 2¹² = 81072751 is a prime.

It is a super-2 number, since 2×81076847² = 13146910238922818, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81076867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40538423 + 40538424.

It is an arithmetic number, because the mean of its divisors is an integer number (40538424).

Almost surely, 2^81076847 is an apocalyptic number.

81076847 is a deficient number, since it is larger than the sum of its proper divisors (1).

81076847 is an equidigital number, since it uses as much as digits as its factorization.

81076847 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75264, while the sum is 41.

The square root of 81076847 is about 9004.2682656616. The cubic root of 81076847 is about 432.8116581554.

The spelling of 81076847 in words is "eighty-one million, seventy-six thousand, eight hundred forty-seven".