987187321 has 2 divisors, whose sum is σ = 987187322. Its totient is φ = 987187320.

The previous prime is 987187307. The next prime is 987187363. The reversal of 987187321 is 123781789.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 621804096 + 365383225 = 24936^2 + 19115^2 .

It is a cyclic number.

It is not a de Polignac number, because 987187321 - 2⁷ = 987187193 is a prime.

It is not a weakly prime, because it can be changed into another prime (987187391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493593660 + 493593661.

It is an arithmetic number, because the mean of its divisors is an integer number (493593661).

Almost surely, 2^987187321 is an apocalyptic number.

It is an amenable number.

987187321 is a deficient number, since it is larger than the sum of its proper divisors (1).

987187321 is an equidigital number, since it uses as much as digits as its factorization.

987187321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 169344, while the sum is 46.

The square root of 987187321 is about 31419.5372499342. The cubic root of 987187321 is about 995.7107355145.

The spelling of 987187321 in words is "nine hundred eighty-seven million, one hundred eighty-seven thousand, three hundred twenty-one".