81595039 has 2 divisors, whose sum is σ = 81595040. Its totient is φ = 81595038.

The previous prime is 81595001. The next prime is 81595049. The reversal of 81595039 is 93059518.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81595039 - 2¹³ = 81586847 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81594992 and 81595010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81595049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40797519 + 40797520.

It is an arithmetic number, because the mean of its divisors is an integer number (40797520).

Almost surely, 2^81595039 is an apocalyptic number.

81595039 is a deficient number, since it is larger than the sum of its proper divisors (1).

81595039 is an equidigital number, since it uses as much as digits as its factorization.

81595039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48600, while the sum is 40.

The square root of 81595039 is about 9032.9972323698. The cubic root of 81595039 is about 433.7317868923.

The spelling of 81595039 in words is "eighty-one million, five hundred ninety-five thousand, thirty-nine".