987652409 has 2 divisors, whose sum is σ = 987652410. Its totient is φ = 987652408.

The previous prime is 987652399. The next prime is 987652429. The reversal of 987652409 is 904256789.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 686282809 + 301369600 = 26197^2 + 17360^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-987652409 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (987652429) 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, 493826204 + 493826205.

It is an arithmetic number, because the mean of its divisors is an integer number (493826205).

Almost surely, 2^987652409 is an apocalyptic number.

It is an amenable number.

987652409 is a deficient number, since it is larger than the sum of its proper divisors (1).

987652409 is an equidigital number, since it uses as much as digits as its factorization.

987652409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1088640, while the sum is 50.

The square root of 987652409 is about 31426.9376331834. The cubic root of 987652409 is about 995.8670788274.

The spelling of 987652409 in words is "nine hundred eighty-seven million, six hundred fifty-two thousand, four hundred nine".