81675329 has 2 divisors, whose sum is σ = 81675330. Its totient is φ = 81675328.

The previous prime is 81675313. The next prime is 81675337. The reversal of 81675329 is 92357618.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77880625 + 3794704 = 8825^2 + 1948^2 .

It is a cyclic number.

It is not a de Polignac number, because 81675329 - 2⁴ = 81675313 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81675379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40837664 + 40837665.

It is an arithmetic number, because the mean of its divisors is an integer number (40837665).

Almost surely, 2^81675329 is an apocalyptic number.

It is an amenable number.

81675329 is a deficient number, since it is larger than the sum of its proper divisors (1).

81675329 is an equidigital number, since it uses as much as digits as its factorization.

81675329 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 41.

The square root of 81675329 is about 9037.4404009100. The cubic root of 81675329 is about 433.8740051341.

The spelling of 81675329 in words is "eighty-one million, six hundred seventy-five thousand, three hundred twenty-nine".