988647221 has 2 divisors, whose sum is σ = 988647222. Its totient is φ = 988647220.

The previous prime is 988647167. The next prime is 988647229. The reversal of 988647221 is 122746889.

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., 968080996 + 20566225 = 31114^2 + 4535^2 .

It is a cyclic number.

It is not a de Polignac number, because 988647221 - 2¹⁴ = 988630837 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (988647229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494323610 + 494323611.

It is an arithmetic number, because the mean of its divisors is an integer number (494323611).

Almost surely, 2^988647221 is an apocalyptic number.

It is an amenable number.

988647221 is a deficient number, since it is larger than the sum of its proper divisors (1).

988647221 is an equidigital number, since it uses as much as digits as its factorization.

988647221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 387072, while the sum is 47.

The square root of 988647221 is about 31442.7610269836. The cubic root of 988647221 is about 996.2013287012.

The spelling of 988647221 in words is "nine hundred eighty-eight million, six hundred forty-seven thousand, two hundred twenty-one".