81007307 has 2 divisors, whose sum is σ = 81007308. Its totient is φ = 81007306.

The previous prime is 81007291. The next prime is 81007321. The reversal of 81007307 is 70370018.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81007307 - 2⁴ = 81007291 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81007607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40503653 + 40503654.

It is an arithmetic number, because the mean of its divisors is an integer number (40503654).

Almost surely, 2^81007307 is an apocalyptic number.

81007307 is a deficient number, since it is larger than the sum of its proper divisors (1).

81007307 is an equidigital number, since it uses as much as digits as its factorization.

81007307 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1176, while the sum is 26.

The square root of 81007307 is about 9000.4059352898. The cubic root of 81007307 is about 432.6878812166.

The spelling of 81007307 in words is "eighty-one million, seven thousand, three hundred seven".