998387501 has 2 divisors, whose sum is σ = 998387502. Its totient is φ = 998387500.

The previous prime is 998387483. The next prime is 998387521. The reversal of 998387501 is 105783899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 543589225 + 454798276 = 23315^2 + 21326^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-998387501 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 998387501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998387521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499193750 + 499193751.

It is an arithmetic number, because the mean of its divisors is an integer number (499193751).

Almost surely, 2^998387501 is an apocalyptic number.

It is an amenable number.

998387501 is a deficient number, since it is larger than the sum of its proper divisors (1).

998387501 is an equidigital number, since it uses as much as digits as its factorization.

998387501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 544320, while the sum is 50.

The square root of 998387501 is about 31597.2704675578. The cubic root of 998387501 is about 999.4622111684.

The spelling of 998387501 in words is "nine hundred ninety-eight million, three hundred eighty-seven thousand, five hundred one".