2117957479 has 8 divisors (see below), whose sum is σ = 2385031680. Its totient is φ = 1863305400.

The previous prime is 2117957473. The next prime is 2117957497. The reversal of 2117957479 is 9747597112.

It is a happy number.

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

It is not a de Polignac number, because 2117957479 - 2¹¹ = 2117955431 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 (2117957473) 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, 3105169 + ... + 3105850.

It is an arithmetic number, because the mean of its divisors is an integer number (298128960).

Almost surely, 2^2117957479 is an apocalyptic number.

2117957479 is a deficient number, since it is larger than the sum of its proper divisors (267074201).

2117957479 is a wasteful number, since it uses less digits than its factorization.

2117957479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6211061.

The product of its digits is 1111320, while the sum is 52.

The square root of 2117957479 is about 46021.2720271833. The cubic root of 2117957479 is about 1284.2189642764.

The spelling of 2117957479 in words is "two billion, one hundred seventeen million, nine hundred fifty-seven thousand, four hundred seventy-nine".