87571121 has 16 divisors (see below), whose sum is σ = 98352576. Its totient is φ = 77280000.

The previous prime is 87571117. The next prime is 87571123. The reversal of 87571121 is 12117578.

It is a cyclic number.

It is not a de Polignac number, because 87571121 - 2² = 87571117 is a prime.

It is a deceptive number, since it divides R_87571120.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (87571123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126386 + ... + 127076.

It is an arithmetic number, because the mean of its divisors is an integer number (6147036).

It is a Poulet number, since it divides 2^87571120-1.

Almost surely, 2^87571121 is an apocalyptic number.

It is an amenable number.

87571121 is a deficient number, since it is larger than the sum of its proper divisors (10781455).

87571121 is a wasteful number, since it uses less digits than its factorization.

87571121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1024.

The product of its digits is 3920, while the sum is 32.

The square root of 87571121 is about 9357.9442721145. The cubic root of 87571121 is about 444.0722513835.

Adding to 87571121 its reverse (12117578), we get a palindrome (99688699).

The spelling of 87571121 in words is "eighty-seven million, five hundred seventy-one thousand, one hundred twenty-one".