987809525 has 12 divisors (see below), whose sum is σ = 1289352000. Its totient is φ = 748655280.

The previous prime is 987809507. The next prime is 987809527. The reversal of 987809525 is 525908789.

It is not a de Polignac number, because 987809525 - 2¹⁰ = 987808501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987809527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1039325 + ... + 1040274.

It is an arithmetic number, because the mean of its divisors is an integer number (107446000).

Almost surely, 2^987809525 is an apocalyptic number.

987809525 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

It is an amenable number.

987809525 is a deficient number, since it is larger than the sum of its proper divisors (301542475).

987809525 is a wasteful number, since it uses less digits than its factorization.

987809525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2079628 (or 2079623 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 53.

The square root of 987809525 is about 31429.4372364508. The cubic root of 987809525 is about 995.9198836247.

The spelling of 987809525 in words is "nine hundred eighty-seven million, eight hundred nine thousand, five hundred twenty-five".