987212789 has 2 divisors, whose sum is σ = 987212790. Its totient is φ = 987212788.

The previous prime is 987212753. The next prime is 987212803.

It is a happy number.

987212789 is nontrivially palindromic in base 10.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 987027889 + 184900 = 31417^2 + 430^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 987212789 - 2²⁰ = 986164213 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 987212789.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (987212489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493606394 + 493606395.

It is an arithmetic number, because the mean of its divisors is an integer number (493606395).

Almost surely, 2^987212789 is an apocalyptic number.

It is an amenable number.

987212789 is a deficient number, since it is larger than the sum of its proper divisors (1).

987212789 is an equidigital number, since it uses as much as digits as its factorization.

987212789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 53.

The square root of 987212789 is about 31419.9425365483. The cubic root of 987212789 is about 995.7192980714.

The spelling of 987212789 in words is "nine hundred eighty-seven million, two hundred twelve thousand, seven hundred eighty-nine".