81147411 has 12 divisors (see below), whose sum is σ = 117483288. Its totient is φ = 53973504.

The previous prime is 81147403. The next prime is 81147413. The reversal of 81147411 is 11474118.

It is not a de Polignac number, because 81147411 - 2³ = 81147403 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (81147413) 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 in 11 ways as a sum of consecutive naturals, for example, 6190 + ... + 14163.

It is an arithmetic number, because the mean of its divisors is an integer number (9790274).

Almost surely, 2^81147411 is an apocalyptic number.

81147411 is a deficient number, since it is larger than the sum of its proper divisors (36335877).

81147411 is a wasteful number, since it uses less digits than its factorization.

81147411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20802 (or 20799 counting only the distinct ones).

The product of its digits is 896, while the sum is 27.

The square root of 81147411 is about 9008.1857773916. The cubic root of 81147411 is about 432.9371854257.

The spelling of 81147411 in words is "eighty-one million, one hundred forty-seven thousand, four hundred eleven".