998772497 has 2 divisors, whose sum is σ = 998772498. Its totient is φ = 998772496.

The previous prime is 998772461. The next prime is 998772503. The reversal of 998772497 is 794277899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 803779201 + 194993296 = 28351^2 + 13964^2 .

It is a cyclic number.

It is not a de Polignac number, because 998772497 - 2¹² = 998768401 is a prime.

It is not a weakly prime, because it can be changed into another prime (998742497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499386248 + 499386249.

It is an arithmetic number, because the mean of its divisors is an integer number (499386249).

Almost surely, 2^998772497 is an apocalyptic number.

It is an amenable number.

998772497 is a deficient number, since it is larger than the sum of its proper divisors (1).

998772497 is an equidigital number, since it uses as much as digits as its factorization.

998772497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16003008, while the sum is 62.

The square root of 998772497 is about 31603.3621154459. The cubic root of 998772497 is about 999.5906648009.

The spelling of 998772497 in words is "nine hundred ninety-eight million, seven hundred seventy-two thousand, four hundred ninety-seven".