987751331 has 4 divisors (see below), whose sum is σ = 1128858672. Its totient is φ = 846643992.

The previous prime is 987751283. The next prime is 987751363. The reversal of 987751331 is 133157789.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 133157789 = 661 ⋅201449.

It is a cyclic number.

It is not a de Polignac number, because 987751331 - 2¹⁰ = 987750307 is a prime.

It is a super-2 number, since 2×987751331² = 1951305383784543122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (987711331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70553660 + ... + 70553673.

It is an arithmetic number, because the mean of its divisors is an integer number (282214668).

Almost surely, 2^987751331 is an apocalyptic number.

987751331 is a deficient number, since it is larger than the sum of its proper divisors (141107341).

987751331 is a wasteful number, since it uses less digits than its factorization.

987751331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141107340.

The product of its digits is 158760, while the sum is 44.

The square root of 987751331 is about 31428.5114346830. The cubic root of 987751331 is about 995.9003259744.

The spelling of 987751331 in words is "nine hundred eighty-seven million, seven hundred fifty-one thousand, three hundred thirty-one".