999917671 has 2 divisors, whose sum is σ = 999917672. Its totient is φ = 999917670.

The previous prime is 999917669. The next prime is 999917687. The reversal of 999917671 is 176719999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999917671 - 2¹ = 999917669 is a prime.

Together with 999917669, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999915671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499958835 + 499958836.

It is an arithmetic number, because the mean of its divisors is an integer number (499958836).

Almost surely, 2^999917671 is an apocalyptic number.

999917671 is a deficient number, since it is larger than the sum of its proper divisors (1).

999917671 is an equidigital number, since it uses as much as digits as its factorization.

999917671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1928934, while the sum is 58.

The square root of 999917671 is about 31621.4748391026. The cubic root of 999917671 is about 999.9725562468.

The spelling of 999917671 in words is "nine hundred ninety-nine million, nine hundred seventeen thousand, six hundred seventy-one".