81164467 has 2 divisors, whose sum is σ = 81164468. Its totient is φ = 81164466.

The previous prime is 81164453. The next prime is 81164491. The reversal of 81164467 is 76446118.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81164467 is a prime.

It is not a weakly prime, because it can be changed into another prime (81164437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40582233 + 40582234.

It is an arithmetic number, because the mean of its divisors is an integer number (40582234).

Almost surely, 2^81164467 is an apocalyptic number.

81164467 is a deficient number, since it is larger than the sum of its proper divisors (1).

81164467 is an equidigital number, since it uses as much as digits as its factorization.

81164467 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 37.

The square root of 81164467 is about 9009.1324221592. The cubic root of 81164467 is about 432.9675156574.

The spelling of 81164467 in words is "eighty-one million, one hundred sixty-four thousand, four hundred sixty-seven".