81058207 has 2 divisors, whose sum is σ = 81058208. Its totient is φ = 81058206.

The previous prime is 81058183. The next prime is 81058217. The reversal of 81058207 is 70285018.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81058207 - 2⁷ = 81058079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81058217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40529103 + 40529104.

It is an arithmetic number, because the mean of its divisors is an integer number (40529104).

Almost surely, 2^81058207 is an apocalyptic number.

81058207 is a deficient number, since it is larger than the sum of its proper divisors (1).

81058207 is an equidigital number, since it uses as much as digits as its factorization.

81058207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 81058207 is about 9003.2331414887. The cubic root of 81058207 is about 432.7784870429.

The spelling of 81058207 in words is "eighty-one million, fifty-eight thousand, two hundred seven".