987820523 has 4 divisors (see below), whose sum is σ = 998919720. Its totient is φ = 976721328.

The previous prime is 987820517. The next prime is 987820541. The reversal of 987820523 is 325028789.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-987820523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (987820423) 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, 5549465 + ... + 5549642.

It is an arithmetic number, because the mean of its divisors is an integer number (249729930).

Almost surely, 2^987820523 is an apocalyptic number.

987820523 is a deficient number, since it is larger than the sum of its proper divisors (11099197).

987820523 is a wasteful number, since it uses less digits than its factorization.

987820523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11099196.

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 987820523 is about 31429.6121993257. The cubic root of 987820523 is about 995.9235797105.

The spelling of 987820523 in words is "nine hundred eighty-seven million, eight hundred twenty thousand, five hundred twenty-three".