987830561 has 2 divisors, whose sum is σ = 987830562. Its totient is φ = 987830560.

The previous prime is 987830489. The next prime is 987830563. The reversal of 987830561 is 165038789.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 828288400 + 159542161 = 28780^2 + 12631^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-987830561 is a prime.

Together with 987830563, it forms a pair of twin primes.

It is a Chen prime.

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

It is not a weakly prime, because it can be changed into another prime (987830563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493915280 + 493915281.

It is an arithmetic number, because the mean of its divisors is an integer number (493915281).

Almost surely, 2^987830561 is an apocalyptic number.

It is an amenable number.

987830561 is a deficient number, since it is larger than the sum of its proper divisors (1).

987830561 is an equidigital number, since it uses as much as digits as its factorization.

987830561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 47.

The square root of 987830561 is about 31429.7718890863. The cubic root of 987830561 is about 995.9269531462.

The spelling of 987830561 in words is "nine hundred eighty-seven million, eight hundred thirty thousand, five hundred sixty-one".