998724497 has 2 divisors, whose sum is σ = 998724498. Its totient is φ = 998724496.

The previous prime is 998724473. The next prime is 998724499. The reversal of 998724497 is 794427899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 712302721 + 286421776 = 26689^2 + 16924^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-998724497 is a prime.

Together with 998724499, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (998724499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499362248 + 499362249.

It is an arithmetic number, because the mean of its divisors is an integer number (499362249).

Almost surely, 2^998724497 is an apocalyptic number.

It is an amenable number.

998724497 is a deficient number, since it is larger than the sum of its proper divisors (1).

998724497 is an equidigital number, since it uses as much as digits as its factorization.

998724497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9144576, while the sum is 59.

The square root of 998724497 is about 31602.6026934492. The cubic root of 998724497 is about 999.5746514376.

The spelling of 998724497 in words is "nine hundred ninety-eight million, seven hundred twenty-four thousand, four hundred ninety-seven".