11125641809 has 4 divisors (see below), whose sum is σ = 11509284660. Its totient is φ = 10741998960.

The previous prime is 11125641803. The next prime is 11125641817. The reversal of 11125641809 is 90814652111.

It is a happy number.

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 3684854209 + 7440787600 = 60703^2 + 86260^2 .

It is a cyclic number.

It is not a de Polignac number, because 11125641809 - 2¹² = 11125637713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11125641803) 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, 191821382 + ... + 191821439.

It is an arithmetic number, because the mean of its divisors is an integer number (2877321165).

Almost surely, 2^11125641809 is an apocalyptic number.

It is an amenable number.

11125641809 is a deficient number, since it is larger than the sum of its proper divisors (383642851).

11125641809 is an equidigital number, since it uses as much as digits as its factorization.

11125641809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383642850.

The product of its (nonzero) digits is 17280, while the sum is 38.

The spelling of 11125641809 in words is "eleven billion, one hundred twenty-five million, six hundred forty-one thousand, eight hundred nine".