9945973171 has 2 divisors, whose sum is σ = 9945973172. Its totient is φ = 9945973170.

The previous prime is 9945973153. The next prime is 9945973189. The reversal of 9945973171 is 1713795499.

It is a balanced prime because it is at equal distance from previous prime (9945973153) and next prime (9945973189).

It is a cyclic number.

It is not a de Polignac number, because 9945973171 - 2²³ = 9937584563 is a prime.

It is the 99730-th Hogben number.

It is not a weakly prime, because it can be changed into another prime (9945970171) by changing a digit.

It is a nontrivial repunit in base 99729.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4972986585 + 4972986586.

It is an arithmetic number, because the mean of its divisors is an integer number (4972986586).

Almost surely, 2^9945973171 is an apocalyptic number.

9945973171 is a deficient number, since it is larger than the sum of its proper divisors (1).

9945973171 is an equidigital number, since it uses as much as digits as its factorization.

9945973171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2143260, while the sum is 55.

The square root of 9945973171 is about 99729.5000037602. The cubic root of 9945973171 is about 2150.5477725244.

The spelling of 9945973171 in words is "nine billion, nine hundred forty-five million, nine hundred seventy-three thousand, one hundred seventy-one".