11349561809 has 4 divisors (see below), whose sum is σ = 11371263216. Its totient is φ = 11327860404.

The previous prime is 11349561803. The next prime is 11349561827. The reversal of 11349561809 is 90816594311.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11349561809 - 2²⁰ = 11348513233 is a prime.

It is a super-2 number, since 2×11349561809² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11349561803) 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, 10849919 + ... + 10850964.

It is an arithmetic number, because the mean of its divisors is an integer number (2842815804).

Almost surely, 2^11349561809 is an apocalyptic number.

It is an amenable number.

11349561809 is a deficient number, since it is larger than the sum of its proper divisors (21701407).

11349561809 is an equidigital number, since it uses as much as digits as its factorization.

11349561809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21701406.

The product of its (nonzero) digits is 233280, while the sum is 47.

The spelling of 11349561809 in words is "eleven billion, three hundred forty-nine million, five hundred sixty-one thousand, eight hundred nine".