987311983 has 4 divisors (see below), whose sum is σ = 1128356560. Its totient is φ = 846267408.

The previous prime is 987311917. The next prime is 987311993. The reversal of 987311983 is 389113789.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 987311983 - 2⁹ = 987311471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987311993) 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, 70522278 + ... + 70522291.

It is an arithmetic number, because the mean of its divisors is an integer number (282089140).

Almost surely, 2^987311983 is an apocalyptic number.

987311983 is a deficient number, since it is larger than the sum of its proper divisors (141044577).

987311983 is a wasteful number, since it uses less digits than its factorization.

987311983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141044576.

The product of its digits is 326592, while the sum is 49.

The square root of 987311983 is about 31421.5210166535. The cubic root of 987311983 is about 995.7526465293.

The spelling of 987311983 in words is "nine hundred eighty-seven million, three hundred eleven thousand, nine hundred eighty-three".