988621189 has 2 divisors, whose sum is σ = 988621190. Its totient is φ = 988621188.

The previous prime is 988621159. The next prime is 988621273. The reversal of 988621189 is 981126889.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 891500164 + 97121025 = 29858^2 + 9855^2 .

It is an emirp because it is prime and its reverse (981126889) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 988621189 - 2⁷ = 988621061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (988621159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494310594 + 494310595.

It is an arithmetic number, because the mean of its divisors is an integer number (494310595).

Almost surely, 2^988621189 is an apocalyptic number.

It is an amenable number.

988621189 is a deficient number, since it is larger than the sum of its proper divisors (1).

988621189 is an equidigital number, since it uses as much as digits as its factorization.

988621189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 497664, while the sum is 52.

The square root of 988621189 is about 31442.3470657011. The cubic root of 988621189 is about 996.1925849889.

The spelling of 988621189 in words is "nine hundred eighty-eight million, six hundred twenty-one thousand, one hundred eighty-nine".