115521134535521 has 8 divisors (see below), whose sum is σ = 135717137076864. Its totient is φ = 96940812197520.

The previous prime is 115521134535517. The next prime is 115521134535529. The reversal of 115521134535521 is 125535431125511.

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

It is a cyclic number.

It is not a de Polignac number, because 115521134535521 - 2² = 115521134535517 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (115521134535529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 403920050681 + ... + 403920050966.

It is an arithmetic number, because the mean of its divisors is an integer number (16964642134608).

Almost surely, 2^{115521134535521} is an apocalyptic number.

115521134535521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

115521134535521 is a deficient number, since it is larger than the sum of its proper divisors (20196002541343).

115521134535521 is a wasteful number, since it uses less digits than its factorization.

115521134535521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807840101671.

The product of its digits is 450000, while the sum is 44.

The spelling of 115521134535521 in words is "one hundred fifteen trillion, five hundred twenty-one billion, one hundred thirty-four million, five hundred thirty-five thousand, five hundred twenty-one".