81504067 has 2 divisors, whose sum is σ = 81504068. Its totient is φ = 81504066.

The previous prime is 81504061. The next prime is 81504079. The reversal of 81504067 is 76040518.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81504067 is a prime.

It is not a weakly prime, because it can be changed into another prime (81504061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40752033 + 40752034.

It is an arithmetic number, because the mean of its divisors is an integer number (40752034).

Almost surely, 2^81504067 is an apocalyptic number.

81504067 is a deficient number, since it is larger than the sum of its proper divisors (1).

81504067 is an equidigital number, since it uses as much as digits as its factorization.

81504067 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 81504067 is about 9027.9602901209. The cubic root of 81504067 is about 433.5705347636.

The spelling of 81504067 in words is "eighty-one million, five hundred four thousand, sixty-seven".