81167039 has 2 divisors, whose sum is σ = 81167040. Its totient is φ = 81167038.

The previous prime is 81167017. The next prime is 81167057. The reversal of 81167039 is 93076118.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81167039 - 2²⁰ = 80118463 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is equal to p_4733738 and since 81167039 and 4733738 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81167059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40583519 + 40583520.

It is an arithmetic number, because the mean of its divisors is an integer number (40583520).

Almost surely, 2^81167039 is an apocalyptic number.

81167039 is a deficient number, since it is larger than the sum of its proper divisors (1).

81167039 is an equidigital number, since it uses as much as digits as its factorization.

81167039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 81167039 is about 9009.2751650729. The cubic root of 81167039 is about 432.9720890080.

The spelling of 81167039 in words is "eighty-one million, one hundred sixty-seven thousand, thirty-nine".