8405235121 has 4 divisors (see below), whose sum is σ = 8410648932. Its totient is φ = 8399821312.

The previous prime is 8405235077. The next prime is 8405235131. The reversal of 8405235121 is 1215325048.

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 1588421025 + 6816814096 = 39855^2 + 82564^2 .

It is a cyclic number.

It is not a de Polignac number, because 8405235121 - 2¹¹ = 8405233073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8405235131) 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, 2704576 + ... + 2707681.

It is an arithmetic number, because the mean of its divisors is an integer number (2102662233).

Almost surely, 2^8405235121 is an apocalyptic number.

It is an amenable number.

8405235121 is a deficient number, since it is larger than the sum of its proper divisors (5413811).

8405235121 is a wasteful number, since it uses less digits than its factorization.

8405235121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5413810.

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 8405235121 is about 91680.0693771553. The cubic root of 8405235121 is about 2033.2149241776.

The spelling of 8405235121 in words is "eight billion, four hundred five million, two hundred thirty-five thousand, one hundred twenty-one".