87121112717 has 4 divisors (see below), whose sum is σ = 87126288060. Its totient is φ = 87115937376.

The previous prime is 87121112657. The next prime is 87121112719. The reversal of 87121112717 is 71721112178.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11005268836 + 76115843881 = 104906^2 + 275891^2 .

It is a cyclic number.

It is not a de Polignac number, because 87121112717 - 2⁶ = 87121112653 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 (87121112719) 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 3 ways as a sum of consecutive naturals, for example, 2562338 + ... + 2596115.

It is an arithmetic number, because the mean of its divisors is an integer number (21781572015).

Almost surely, 2^87121112717 is an apocalyptic number.

It is an amenable number.

87121112717 is a deficient number, since it is larger than the sum of its proper divisors (5175343).

87121112717 is a wasteful number, since it uses less digits than its factorization.

87121112717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5175342.

The product of its digits is 10976, while the sum is 38.

The spelling of 87121112717 in words is "eighty-seven billion, one hundred twenty-one million, one hundred twelve thousand, seven hundred seventeen".