81434147 has 2 divisors, whose sum is σ = 81434148. Its totient is φ = 81434146.

The previous prime is 81434137. The next prime is 81434153. The reversal of 81434147 is 74143418.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81434147 - 2¹⁰ = 81433123 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (81434107) 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, 40717073 + 40717074.

It is an arithmetic number, because the mean of its divisors is an integer number (40717074).

Almost surely, 2^81434147 is an apocalyptic number.

81434147 is a deficient number, since it is larger than the sum of its proper divisors (1).

81434147 is an equidigital number, since it uses as much as digits as its factorization.

81434147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10752, while the sum is 32.

The square root of 81434147 is about 9024.0870452362. The cubic root of 81434147 is about 433.4465167201.

The spelling of 81434147 in words is "eighty-one million, four hundred thirty-four thousand, one hundred forty-seven".