81170329 has 2 divisors, whose sum is σ = 81170330. Its totient is φ = 81170328.

The previous prime is 81170311. The next prime is 81170347. The reversal of 81170329 is 92307118.

It is a balanced prime because it is at equal distance from previous prime (81170311) and next prime (81170347).

It can be written as a sum of positive squares in only one way, i.e., 55160329 + 26010000 = 7427^2 + 5100^2 .

It is a cyclic number.

It is not a de Polignac number, because 81170329 - 2¹⁵ = 81137561 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81170329.

It is not a weakly prime, because it can be changed into another prime (81170029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40585164 + 40585165.

It is an arithmetic number, because the mean of its divisors is an integer number (40585165).

Almost surely, 2^81170329 is an apocalyptic number.

It is an amenable number.

81170329 is a deficient number, since it is larger than the sum of its proper divisors (1).

81170329 is an equidigital number, since it uses as much as digits as its factorization.

81170329 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 81170329 is about 9009.4577528284. The cubic root of 81170329 is about 432.9779389152.

The spelling of 81170329 in words is "eighty-one million, one hundred seventy thousand, three hundred twenty-nine".