11817617311 has 4 divisors (see below), whose sum is σ = 11819724592. Its totient is φ = 11815510032.

The previous prime is 11817617309. The next prime is 11817617351. The reversal of 11817617311 is 11371671811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11371671811 = 173 ⋅65732207.

It is a cyclic number.

It is not a de Polignac number, because 11817617311 - 2¹ = 11817617309 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 (11817617351) 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, 1045206 + ... + 1056451.

It is an arithmetic number, because the mean of its divisors is an integer number (2954931148).

Almost surely, 2^11817617311 is an apocalyptic number.

11817617311 is a deficient number, since it is larger than the sum of its proper divisors (2107281).

11817617311 is an equidigital number, since it uses as much as digits as its factorization.

11817617311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2107280.

The product of its digits is 7056, while the sum is 37.

The spelling of 11817617311 in words is "eleven billion, eight hundred seventeen million, six hundred seventeen thousand, three hundred eleven".