987220189 has 2 divisors, whose sum is σ = 987220190. Its totient is φ = 987220188.

The previous prime is 987220153. The next prime is 987220193. The reversal of 987220189 is 981022789.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 861892164 + 125328025 = 29358^2 + 11195^2 .

It is a cyclic number.

It is not a de Polignac number, because 987220189 - 2⁹ = 987219677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (987221189) 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, 493610094 + 493610095.

It is an arithmetic number, because the mean of its divisors is an integer number (493610095).

Almost surely, 2^987220189 is an apocalyptic number.

It is an amenable number.

987220189 is a deficient number, since it is larger than the sum of its proper divisors (1).

987220189 is an equidigital number, since it uses as much as digits as its factorization.

987220189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 987220189 is about 31420.0602959320. The cubic root of 987220189 is about 995.7217859864.

The spelling of 987220189 in words is "nine hundred eighty-seven million, two hundred twenty thousand, one hundred eighty-nine".