998350621 has 2 divisors, whose sum is σ = 998350622. Its totient is φ = 998350620.

The previous prime is 998350609. The next prime is 998350631. The reversal of 998350621 is 126053899.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 537776100 + 460574521 = 23190^2 + 21461^2 .

It is an emirp because it is prime and its reverse (126053899) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-998350621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998350631) 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, 499175310 + 499175311.

It is an arithmetic number, because the mean of its divisors is an integer number (499175311).

Almost surely, 2^998350621 is an apocalyptic number.

It is an amenable number.

998350621 is a deficient number, since it is larger than the sum of its proper divisors (1).

998350621 is an equidigital number, since it uses as much as digits as its factorization.

998350621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 116640, while the sum is 43.

The square root of 998350621 is about 31596.6868674549. The cubic root of 998350621 is about 999.4499044504.

The spelling of 998350621 in words is "nine hundred ninety-eight million, three hundred fifty thousand, six hundred twenty-one".