998910901 has 2 divisors, whose sum is σ = 998910902. Its totient is φ = 998910900.

The previous prime is 998910889. The next prime is 998910917. The reversal of 998910901 is 109019899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 986022801 + 12888100 = 31401^2 + 3590^2 .

It is a cyclic number.

It is not a de Polignac number, because 998910901 - 2¹¹ = 998908853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998910931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499455450 + 499455451.

It is an arithmetic number, because the mean of its divisors is an integer number (499455451).

Almost surely, 2^998910901 is an apocalyptic number.

It is an amenable number.

998910901 is a deficient number, since it is larger than the sum of its proper divisors (1).

998910901 is an equidigital number, since it uses as much as digits as its factorization.

998910901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52488, while the sum is 46.

The square root of 998910901 is about 31605.5517433251. The cubic root of 998910901 is about 999.6368351272.

The spelling of 998910901 in words is "nine hundred ninety-eight million, nine hundred ten thousand, nine hundred one".