987869321 has 2 divisors, whose sum is σ = 987869322. Its totient is φ = 987869320.

The previous prime is 987869257. The next prime is 987869329. The reversal of 987869321 is 123968789.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 964723600 + 23145721 = 31060^2 + 4811^2 .

It is a cyclic number.

It is not a de Polignac number, because 987869321 - 2⁶ = 987869257 is a prime.

It is not a weakly prime, because it can be changed into another prime (987869329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493934660 + 493934661.

It is an arithmetic number, because the mean of its divisors is an integer number (493934661).

Almost surely, 2^987869321 is an apocalyptic number.

It is an amenable number.

987869321 is a deficient number, since it is larger than the sum of its proper divisors (1).

987869321 is an equidigital number, since it uses as much as digits as its factorization.

987869321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 53.

The square root of 987869321 is about 31430.3884958490. The cubic root of 987869321 is about 995.9399788699.

The spelling of 987869321 in words is "nine hundred eighty-seven million, eight hundred sixty-nine thousand, three hundred twenty-one".