998012879 has 2 divisors, whose sum is σ = 998012880. Its totient is φ = 998012878.

The previous prime is 998012831. The next prime is 998012881. The reversal of 998012879 is 978210899.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 998012879 - 2²⁴ = 981235663 is a prime.

Together with 998012881, it forms a pair of twin primes.

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 998012879.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998012819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499006439 + 499006440.

It is an arithmetic number, because the mean of its divisors is an integer number (499006440).

Almost surely, 2^998012879 is an apocalyptic number.

998012879 is a deficient number, since it is larger than the sum of its proper divisors (1).

998012879 is an equidigital number, since it uses as much as digits as its factorization.

998012879 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 653184, while the sum is 53.

The square root of 998012879 is about 31591.3418360158. The cubic root of 998012879 is about 999.3371871095.

The spelling of 998012879 in words is "nine hundred ninety-eight million, twelve thousand, eight hundred seventy-nine".