998172449 has 2 divisors, whose sum is σ = 998172450. Its totient is φ = 998172448.

The previous prime is 998172437. The next prime is 998172451. The reversal of 998172449 is 944271899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 992565025 + 5607424 = 31505^2 + 2368^2 .

It is a cyclic number.

It is not a de Polignac number, because 998172449 - 2⁴ = 998172433 is a prime.

Together with 998172451, 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 998172449.

It is not a weakly prime, because it can be changed into another prime (998172419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499086224 + 499086225.

It is an arithmetic number, because the mean of its divisors is an integer number (499086225).

Almost surely, 2^998172449 is an apocalyptic number.

It is an amenable number.

998172449 is a deficient number, since it is larger than the sum of its proper divisors (1).

998172449 is an equidigital number, since it uses as much as digits as its factorization.

998172449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1306368, while the sum is 53.

The square root of 998172449 is about 31593.8672688229. The cubic root of 998172449 is about 999.3904448513.

The spelling of 998172449 in words is "nine hundred ninety-eight million, one hundred seventy-two thousand, four hundred forty-nine".