11538939791 has 8 divisors (see below), whose sum is σ = 11956750080. Its totient is φ = 11127923352.

The previous prime is 11538939787. The next prime is 11538939817. The reversal of 11538939791 is 19793983511.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11538939791 - 2² = 11538939787 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11538939751) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1695005 + ... + 1701798.

It is an arithmetic number, because the mean of its divisors is an integer number (1494593760).

Almost surely, 2^11538939791 is an apocalyptic number.

11538939791 is a deficient number, since it is larger than the sum of its proper divisors (417810289).

11538939791 is an equidigital number, since it uses as much as digits as its factorization.

11538939791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3396925.

The product of its digits is 1837080, while the sum is 56.

The spelling of 11538939791 in words is "eleven billion, five hundred thirty-eight million, nine hundred thirty-nine thousand, seven hundred ninety-one".