81804707 has 2 divisors, whose sum is σ = 81804708. Its totient is φ = 81804706.

The previous prime is 81804689. The next prime is 81804757. The reversal of 81804707 is 70740818.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81804707 - 2⁶ = 81804643 is a prime.

It is not a weakly prime, because it can be changed into another prime (81804757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40902353 + 40902354.

It is an arithmetic number, because the mean of its divisors is an integer number (40902354).

Almost surely, 2^81804707 is an apocalyptic number.

81804707 is a deficient number, since it is larger than the sum of its proper divisors (1).

81804707 is an equidigital number, since it uses as much as digits as its factorization.

81804707 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12544, while the sum is 35.

The square root of 81804707 is about 9044.5954580622. The cubic root of 81804707 is about 434.1029773267.

The spelling of 81804707 in words is "eighty-one million, eight hundred four thousand, seven hundred seven".