11311217471 has 4 divisors (see below), whose sum is σ = 11311752792. Its totient is φ = 11310682152.

The previous prime is 11311217453. The next prime is 11311217501. The reversal of 11311217471 is 17471211311.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17471211311 = 127 ⋅137568593.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11311217471 is a prime.

It is a super-3 number, since 3×11311217471³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11311217431) 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, 234605 + ... + 278678.

It is an arithmetic number, because the mean of its divisors is an integer number (2827938198).

Almost surely, 2^11311217471 is an apocalyptic number.

11311217471 is a deficient number, since it is larger than the sum of its proper divisors (535321).

11311217471 is an equidigital number, since it uses as much as digits as its factorization.

11311217471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535320.

The product of its digits is 1176, while the sum is 29.

Adding to 11311217471 its reverse (17471211311), we get a palindrome (28782428782).

The spelling of 11311217471 in words is "eleven billion, three hundred eleven million, two hundred seventeen thousand, four hundred seventy-one".