987555331 has 16 divisors (see below), whose sum is σ = 1148281344. Its totient is φ = 831849984.

The previous prime is 987555293. The next prime is 987555353. The reversal of 987555331 is 133555789.

It is not a de Polignac number, because 987555331 - 2⁷ = 987555203 is a prime.

It is a super-2 number, since 2×987555331² = 1950531063573039122, which contains 22 as substring.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (987555391) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107730 + ... + 116536.

It is an arithmetic number, because the mean of its divisors is an integer number (71767584).

Almost surely, 2^987555331 is an apocalyptic number.

987555331 is a deficient number, since it is larger than the sum of its proper divisors (160726013).

987555331 is a wasteful number, since it uses less digits than its factorization.

987555331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9090.

The product of its digits is 567000, while the sum is 46.

The square root of 987555331 is about 31425.3930922113. The cubic root of 987555331 is about 995.8344492805.

The spelling of 987555331 in words is "nine hundred eighty-seven million, five hundred fifty-five thousand, three hundred thirty-one".