9988888501 has 2 divisors, whose sum is σ = 9988888502. Its totient is φ = 9988888500.

The previous prime is 9988888489. The next prime is 9988888517. The reversal of 9988888501 is 1058888899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7264152900 + 2724735601 = 85230^2 + 52199^2 .

It is an emirp because it is prime and its reverse (1058888899) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9988888501 - 2⁹ = 9988887989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9988888801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4994444250 + 4994444251.

It is an arithmetic number, because the mean of its divisors is an integer number (4994444251).

Almost surely, 2^9988888501 is an apocalyptic number.

It is an amenable number.

9988888501 is a deficient number, since it is larger than the sum of its proper divisors (1).

9988888501 is an equidigital number, since it uses as much as digits as its factorization.

9988888501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13271040, while the sum is 64.

The square root of 9988888501 is about 99944.4270632435. The cubic root of 9988888501 is about 2153.6364276657.

The spelling of 9988888501 in words is "nine billion, nine hundred eighty-eight million, eight hundred eighty-eight thousand, five hundred one".