81675007 has 2 divisors, whose sum is σ = 81675008. Its totient is φ = 81675006.

The previous prime is 81674981. The next prime is 81675023. The reversal of 81675007 is 70057618.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81675007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81675037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40837503 + 40837504.

It is an arithmetic number, because the mean of its divisors is an integer number (40837504).

Almost surely, 2^81675007 is an apocalyptic number.

81675007 is a deficient number, since it is larger than the sum of its proper divisors (1).

81675007 is an equidigital number, since it uses as much as digits as its factorization.

81675007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11760, while the sum is 34.

The square root of 81675007 is about 9037.4225861138. The cubic root of 81675007 is about 433.8734349595.

The spelling of 81675007 in words is "eighty-one million, six hundred seventy-five thousand, seven".