81416207 has 2 divisors, whose sum is σ = 81416208. Its totient is φ = 81416206.

The previous prime is 81416191. The next prime is 81416219. The reversal of 81416207 is 70261418.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81416207 - 2⁴ = 81416191 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 81416207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81416227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40708103 + 40708104.

It is an arithmetic number, because the mean of its divisors is an integer number (40708104).

Almost surely, 2^81416207 is an apocalyptic number.

81416207 is a deficient number, since it is larger than the sum of its proper divisors (1).

81416207 is an equidigital number, since it uses as much as digits as its factorization.

81416207 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 81416207 is about 9023.0929841158. The cubic root of 81416207 is about 433.4146848581.

The spelling of 81416207 in words is "eighty-one million, four hundred sixteen thousand, two hundred seven".