11917290847 has 42 divisors (see below), whose sum is σ = 15480607848. Its totient is φ = 8986645800.

The previous prime is 11917290829. The next prime is 11917290877. The reversal of 11917290847 is 74809271911.

It is not a de Polignac number, because 11917290847 - 2²⁷ = 11783073119 is a prime.

It is a super-2 number, since 2×11917290847² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11917290847.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11917290877) by changing a digit.

It is a polite number, since it can be written in 41 ways as a sum of consecutive naturals, for example, 384428722 + ... + 384428752.

Almost surely, 2^11917290847 is an apocalyptic number.

11917290847 is a deficient number, since it is larger than the sum of its proper divisors (3563317001).

11917290847 is an frugal number, since it uses more digits than its factorization.

11917290847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135 (or 49 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 49.

The spelling of 11917290847 in words is "eleven billion, nine hundred seventeen million, two hundred ninety thousand, eight hundred forty-seven".