987531583 has 2 divisors, whose sum is σ = 987531584. Its totient is φ = 987531582.

The previous prime is 987531551. The next prime is 987531637. The reversal of 987531583 is 385135789.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 987531583 - 2⁵ = 987531551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (987531283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493765791 + 493765792.

It is an arithmetic number, because the mean of its divisors is an integer number (493765792).

Almost surely, 2^987531583 is an apocalyptic number.

987531583 is a deficient number, since it is larger than the sum of its proper divisors (1).

987531583 is an equidigital number, since it uses as much as digits as its factorization.

987531583 is an evil number, because the sum of its binary digits is even.

The product of its digits is 907200, while the sum is 49.

The square root of 987531583 is about 31425.0152426375. The cubic root of 987531583 is about 995.8264668531.

The spelling of 987531583 in words is "nine hundred eighty-seven million, five hundred thirty-one thousand, five hundred eighty-three".