998951879 has 2 divisors, whose sum is σ = 998951880. Its totient is φ = 998951878.

The previous prime is 998951861. The next prime is 998951887. The reversal of 998951879 is 978159899.

It is a strong prime.

It is an emirp because it is prime and its reverse (978159899) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 998951879 - 2⁸ = 998951623 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998959879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499475939 + 499475940.

It is an arithmetic number, because the mean of its divisors is an integer number (499475940).

Almost surely, 2^998951879 is an apocalyptic number.

998951879 is a deficient number, since it is larger than the sum of its proper divisors (1).

998951879 is an equidigital number, since it uses as much as digits as its factorization.

998951879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14696640, while the sum is 65.

The square root of 998951879 is about 31606.2000088590. The cubic root of 998951879 is about 999.6505042002.

The spelling of 998951879 in words is "nine hundred ninety-eight million, nine hundred fifty-one thousand, eight hundred seventy-nine".