2155117471 has 4 divisors (see below), whose sum is σ = 2320895752. Its totient is φ = 1989339192.

The previous prime is 2155117463. The next prime is 2155117501. The reversal of 2155117471 is 1747115512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2155117471 - 2³ = 2155117463 is a prime.

It is a super-3 number, since 3×2155117471³ (a number of 29 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 (2155117771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82889121 + ... + 82889146.

It is an arithmetic number, because the mean of its divisors is an integer number (580223938).

Almost surely, 2^2155117471 is an apocalyptic number.

2155117471 is a deficient number, since it is larger than the sum of its proper divisors (165778281).

2155117471 is a wasteful number, since it uses less digits than its factorization.

2155117471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165778280.

The product of its digits is 9800, while the sum is 34.

The square root of 2155117471 is about 46423.2427884998. The cubic root of 2155117471 is about 1291.6860894163.

The spelling of 2155117471 in words is "two billion, one hundred fifty-five million, one hundred seventeen thousand, four hundred seventy-one".