987517 has 4 divisors (see below), whose sum is σ = 1008576. Its totient is φ = 966460.

The previous prime is 987509. The next prime is 987523. The reversal of 987517 is 715789.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 987517 - 2³ = 987509 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 (987587) 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, 10459 + ... + 10552.

It is an arithmetic number, because the mean of its divisors is an integer number (252144).

2⁹⁸⁷⁵¹⁷ is an apocalyptic number.

It is an amenable number.

987517 is a deficient number, since it is larger than the sum of its proper divisors (21059).

987517 is a wasteful number, since it uses less digits than its factorization.

987517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21058.

The product of its digits is 17640, while the sum is 37.

The square root of 987517 is about 993.7388993091. The cubic root of 987517 is about 99.5821564998.

The spelling of 987517 in words is "nine hundred eighty-seven thousand, five hundred seventeen".