998016521 has 2 divisors, whose sum is σ = 998016522. Its totient is φ = 998016520.

The previous prime is 998016473. The next prime is 998016533. The reversal of 998016521 is 125610899.

It is a happy number.

998016521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 758231296 + 239785225 = 27536^2 + 15485^2 .

It is a cyclic number.

It is not a de Polignac number, because 998016521 - 2⁶ = 998016457 is a prime.

It is not a weakly prime, because it can be changed into another prime (998016571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499008260 + 499008261.

It is an arithmetic number, because the mean of its divisors is an integer number (499008261).

Almost surely, 2^998016521 is an apocalyptic number.

It is an amenable number.

998016521 is a deficient number, since it is larger than the sum of its proper divisors (1).

998016521 is an equidigital number, since it uses as much as digits as its factorization.

998016521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 41.

The square root of 998016521 is about 31591.3994783390. The cubic root of 998016521 is about 999.3384027189.

The spelling of 998016521 in words is "nine hundred ninety-eight million, sixteen thousand, five hundred twenty-one".