87117131 has 8 divisors (see below), whose sum is σ = 90255600. Its totient is φ = 83987680.

The previous prime is 87117113. The next prime is 87117133. The reversal of 87117131 is 13171178.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87117131 is a prime.

It is a super-2 number, since 2×87117131² = 15178789027342322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 87117094 and 87117103.

It is not an unprimeable number, because it can be changed into a prime (87117133) 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 7 ways as a sum of consecutive naturals, for example, 21980 + ... + 25638.

It is an arithmetic number, because the mean of its divisors is an integer number (11281950).

Almost surely, 2^87117131 is an apocalyptic number.

87117131 is a deficient number, since it is larger than the sum of its proper divisors (3138469).

87117131 is a wasteful number, since it uses less digits than its factorization.

87117131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4509.

The product of its digits is 1176, while the sum is 29.

The square root of 87117131 is about 9333.6558218096. The cubic root of 87117131 is about 443.3035285646.

The spelling of 87117131 in words is "eighty-seven million, one hundred seventeen thousand, one hundred thirty-one".