998992481 has 2 divisors, whose sum is σ = 998992482. Its totient is φ = 998992480.

The previous prime is 998992447. The next prime is 998992513. The reversal of 998992481 is 184299899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 935136400 + 63856081 = 30580^2 + 7991^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-998992481 is a prime.

It is a super-2 number, since 2×998992481² = 1995971954189070722, which contains 22 as substring.

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 998992481.

It is not a weakly prime, because it can be changed into another prime (998992381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499496240 + 499496241.

It is an arithmetic number, because the mean of its divisors is an integer number (499496241).

Almost surely, 2^998992481 is an apocalyptic number.

It is an amenable number.

998992481 is a deficient number, since it is larger than the sum of its proper divisors (1).

998992481 is an equidigital number, since it uses as much as digits as its factorization.

998992481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3359232, while the sum is 59.

The square root of 998992481 is about 31606.8423130182. The cubic root of 998992481 is about 999.6640474819.

The spelling of 998992481 in words is "nine hundred ninety-eight million, nine hundred ninety-two thousand, four hundred eighty-one".