988842221 has 2 divisors, whose sum is σ = 988842222. Its totient is φ = 988842220.

The previous prime is 988842209. The next prime is 988842229. The reversal of 988842221 is 122248889.

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., 553660900 + 435181321 = 23530^2 + 20861^2 .

It is a cyclic number.

It is not a de Polignac number, because 988842221 - 2⁶ = 988842157 is a prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (988842229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494421110 + 494421111.

It is an arithmetic number, because the mean of its divisors is an integer number (494421111).

Almost surely, 2^988842221 is an apocalyptic number.

It is an amenable number.

988842221 is a deficient number, since it is larger than the sum of its proper divisors (1).

988842221 is an equidigital number, since it uses as much as digits as its factorization.

988842221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 147456, while the sum is 44.

The square root of 988842221 is about 31445.8617468181. The cubic root of 988842221 is about 996.2668210509.

The spelling of 988842221 in words is "nine hundred eighty-eight million, eight hundred forty-two thousand, two hundred twenty-one".