113533280809 has 9 divisors (see below), whose sum is σ = 122943148023. Its totient is φ = 104795908152.

The previous prime is 113533280797. The next prime is 113533280857. The reversal of 113533280809 is 908082335311.

The square root of 113533280809 is 336947.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 16794864025 + 96738416784 = 129595^2 + 311028^2 .

It is a de Polignac number, because none of the positive numbers 2^k-113533280809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (113533280009) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4367352 + ... + 4393270.

Almost surely, 2^113533280809 is an apocalyptic number.

113533280809 is the 336947-th square number.

113533280809 is the 168474-th centered octagonal number.

It is an amenable number.

113533280809 is a deficient number, since it is larger than the sum of its proper divisors (9409867214).

113533280809 is an frugal number, since it uses more digits than its factorization.

113533280809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51864 (or 25932 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 43.

The spelling of 113533280809 in words is "one hundred thirteen billion, five hundred thirty-three million, two hundred eighty thousand, eight hundred nine".