11739072409 has 3 divisors (see below), whose sum is σ = 11739180757. Its totient is φ = 11738964062.

The previous prime is 11739072361. The next prime is 11739072413. The reversal of 11739072409 is 90427093711.

It is a happy number.

The square root of 11739072409 is 108347.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a de Polignac number, because none of the positive numbers 2^k-11739072409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11739072439) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 54174 + ... + 162520.

Almost surely, 2^11739072409 is an apocalyptic number.

11739072409 is the 108347-th square number.

11739072409 is the 54174-th centered octagonal number.

It is an amenable number.

11739072409 is a deficient number, since it is larger than the sum of its proper divisors (108348).

11739072409 is an frugal number, since it uses more digits than its factorization.

11739072409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216694 (or 108347 counting only the distinct ones).

The product of its (nonzero) digits is 95256, while the sum is 43.

The spelling of 11739072409 in words is "eleven billion, seven hundred thirty-nine million, seventy-two thousand, four hundred nine".