87135021088513 has 4 divisors (see below), whose sum is σ = 89260265505348. Its totient is φ = 85009776671680.

The previous prime is 87135021088499. The next prime is 87135021088523. The reversal of 87135021088513 is 31588012053178.

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 6622140515904 + 80512880572609 = 2573352^2 + 8972897^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87135021088513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87135021088523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1062622208356 + ... + 1062622208437.

It is an arithmetic number, because the mean of its divisors is an integer number (22315066376337).

Almost surely, 2^{87135021088513} is an apocalyptic number.

It is an amenable number.

87135021088513 is a deficient number, since it is larger than the sum of its proper divisors (2125244416835).

87135021088513 is a wasteful number, since it uses less digits than its factorization.

87135021088513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2125244416834.

The product of its (nonzero) digits is 1612800, while the sum is 52.

The spelling of 87135021088513 in words is "eighty-seven trillion, one hundred thirty-five billion, twenty-one million, eighty-eight thousand, five hundred thirteen".