987511 has 4 divisors (see below), whose sum is σ = 1128592. Its totient is φ = 846432.

The previous prime is 987509. The next prime is 987523. The reversal of 987511 is 115789.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 115789 = 89 ⋅1301.

It is a cyclic number.

It is not a de Polignac number, because 987511 - 2¹ = 987509 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987541) 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, 70530 + ... + 70543.

It is an arithmetic number, because the mean of its divisors is an integer number (282148).

2⁹⁸⁷⁵¹¹ is an apocalyptic number.

987511 is a deficient number, since it is larger than the sum of its proper divisors (141081).

987511 is a wasteful number, since it uses less digits than its factorization.

987511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141080.

The product of its digits is 2520, while the sum is 31.

The square root of 987511 is about 993.7358804028. The cubic root of 987511 is about 99.5819548175.

The spelling of 987511 in words is "nine hundred eighty-seven thousand, five hundred eleven".