998916871 has 2 divisors, whose sum is σ = 998916872. Its totient is φ = 998916870.

The previous prime is 998916859. The next prime is 998916883. The reversal of 998916871 is 178619899.

It is a balanced prime because it is at equal distance from previous prime (998916859) and next prime (998916883).

It is an emirp because it is prime and its reverse (178619899) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-998916871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998916071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499458435 + 499458436.

It is an arithmetic number, because the mean of its divisors is an integer number (499458436).

Almost surely, 2^998916871 is an apocalyptic number.

998916871 is a deficient number, since it is larger than the sum of its proper divisors (1).

998916871 is an equidigital number, since it uses as much as digits as its factorization.

998916871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1959552, while the sum is 58.

The square root of 998916871 is about 31605.6461886164. The cubic root of 998916871 is about 999.6388265695.

The spelling of 998916871 in words is "nine hundred ninety-eight million, nine hundred sixteen thousand, eight hundred seventy-one".