81803207 has 2 divisors, whose sum is σ = 81803208. Its totient is φ = 81803206.

The previous prime is 81803177. The next prime is 81803219. The reversal of 81803207 is 70230818.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81803207 - 2⁸ = 81802951 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81803207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81803297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40901603 + 40901604.

It is an arithmetic number, because the mean of its divisors is an integer number (40901604).

Almost surely, 2^81803207 is an apocalyptic number.

81803207 is a deficient number, since it is larger than the sum of its proper divisors (1).

81803207 is an equidigital number, since it uses as much as digits as its factorization.

81803207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 81803207 is about 9044.5125352337. The cubic root of 81803207 is about 434.1003240220.

The spelling of 81803207 in words is "eighty-one million, eight hundred three thousand, two hundred seven".