998749553 has 2 divisors, whose sum is σ = 998749554. Its totient is φ = 998749552.

The previous prime is 998749529. The next prime is 998749559. The reversal of 998749553 is 355947899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 996475489 + 2274064 = 31567^2 + 1508^2 .

It is an emirp because it is prime and its reverse (355947899) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 998749553 - 2⁶ = 998749489 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 998749492 and 998749501.

It is not a weakly prime, because it can be changed into another prime (998749559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499374776 + 499374777.

It is an arithmetic number, because the mean of its divisors is an integer number (499374777).

Almost surely, 2^998749553 is an apocalyptic number.

It is an amenable number.

998749553 is a deficient number, since it is larger than the sum of its proper divisors (1).

998749553 is an equidigital number, since it uses as much as digits as its factorization.

998749553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12247200, while the sum is 59.

The square root of 998749553 is about 31602.9991140082. Note that the first 3 decimals coincide. The cubic root of 998749553 is about 999.5830104772.

The spelling of 998749553 in words is "nine hundred ninety-eight million, seven hundred forty-nine thousand, five hundred fifty-three".