998072909 has 2 divisors, whose sum is σ = 998072910. Its totient is φ = 998072908.

The previous prime is 998072899. The next prime is 998072921. The reversal of 998072909 is 909270899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 570493225 + 427579684 = 23885^2 + 20678^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-998072909 is a prime.

It is a super-2 number, since 2×998072909² = 1992299063359444562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998072209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499036454 + 499036455.

It is an arithmetic number, because the mean of its divisors is an integer number (499036455).

Almost surely, 2^998072909 is an apocalyptic number.

It is an amenable number.

998072909 is a deficient number, since it is larger than the sum of its proper divisors (1).

998072909 is an equidigital number, since it uses as much as digits as its factorization.

998072909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 734832, while the sum is 53.

The square root of 998072909 is about 31592.2919238222. The cubic root of 998072909 is about 999.3572232599.

The spelling of 998072909 in words is "nine hundred ninety-eight million, seventy-two thousand, nine hundred nine".