81168707 has 2 divisors, whose sum is σ = 81168708. Its totient is φ = 81168706.

The previous prime is 81168673. The next prime is 81168721. The reversal of 81168707 is 70786118.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81168707 - 2¹⁰ = 81167683 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81168007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40584353 + 40584354.

It is an arithmetic number, because the mean of its divisors is an integer number (40584354).

Almost surely, 2^81168707 is an apocalyptic number.

81168707 is a deficient number, since it is larger than the sum of its proper divisors (1).

81168707 is an equidigital number, since it uses as much as digits as its factorization.

81168707 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18816, while the sum is 38.

The square root of 81168707 is about 9009.3677358625. The cubic root of 81168707 is about 432.9750548774.

The spelling of 81168707 in words is "eighty-one million, one hundred sixty-eight thousand, seven hundred seven".