999916871 has 2 divisors, whose sum is σ = 999916872. Its totient is φ = 999916870.

The previous prime is 999916861. The next prime is 999916877. The reversal of 999916871 is 178619999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999916871 - 2⁶ = 999916807 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 999916871.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999916877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499958435 + 499958436.

It is an arithmetic number, because the mean of its divisors is an integer number (499958436).

Almost surely, 2^999916871 is an apocalyptic number.

999916871 is a deficient number, since it is larger than the sum of its proper divisors (1).

999916871 is an equidigital number, since it uses as much as digits as its factorization.

999916871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2204496, while the sum is 59.

The square root of 999916871 is about 31621.4621894687. The cubic root of 999916871 is about 999.9722895655.

The spelling of 999916871 in words is "nine hundred ninety-nine million, nine hundred sixteen thousand, eight hundred seventy-one".