988001221 has 2 divisors, whose sum is σ = 988001222. Its totient is φ = 988001220.

The previous prime is 988001219. The next prime is 988001237. The reversal of 988001221 is 122100889.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 987530625 + 470596 = 31425^2 + 686^2 .

It is a cyclic number.

It is not a de Polignac number, because 988001221 - 2¹ = 988001219 is a prime.

It is a super-2 number, since 2×988001221² = 1952292825394981682, which contains 22 as substring.

Together with 988001219, it forms a pair of twin primes.

988001221 is a modest number, since divided by 1221 gives 988 as remainder.

It is equal to p_50268271 and since 988001221 and 50268271 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (988001621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494000610 + 494000611.

It is an arithmetic number, because the mean of its divisors is an integer number (494000611).

Almost surely, 2^988001221 is an apocalyptic number.

It is an amenable number.

988001221 is a deficient number, since it is larger than the sum of its proper divisors (1).

988001221 is an equidigital number, since it uses as much as digits as its factorization.

988001221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 988001221 is about 31432.4867135898. The cubic root of 988001221 is about 995.9843027612.

The spelling of 988001221 in words is "nine hundred eighty-eight million, one thousand, two hundred twenty-one".