87815419121 has 4 divisors (see below), whose sum is σ = 88404784500. Its totient is φ = 87226053744.

The previous prime is 87815419093. The next prime is 87815419199. The reversal of 87815419121 is 12191451878.

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 52118607025 + 35696812096 = 228295^2 + 188936^2 .

It is a cyclic number.

It is not a de Polignac number, because 87815419121 - 2²² = 87811224817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87815419921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 294682466 + ... + 294682763.

It is an arithmetic number, because the mean of its divisors is an integer number (22101196125).

Almost surely, 2^87815419121 is an apocalyptic number.

It is an amenable number.

87815419121 is a deficient number, since it is larger than the sum of its proper divisors (589365379).

87815419121 is a wasteful number, since it uses less digits than its factorization.

87815419121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 589365378.

The product of its digits is 161280, while the sum is 47.

The spelling of 87815419121 in words is "eighty-seven billion, eight hundred fifteen million, four hundred nineteen thousand, one hundred twenty-one".