2117912505 has 16 divisors (see below), whose sum is σ = 3389408064. Its totient is φ = 1129304000.

The previous prime is 2117912483. The next prime is 2117912507. The reversal of 2117912505 is 5052197112.

It is not a de Polignac number, because 2117912505 - 2⁸ = 2117912249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2117912507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69682 + ... + 95348.

It is an arithmetic number, because the mean of its divisors is an integer number (211838004).

Almost surely, 2^2117912505 is an apocalyptic number.

It is an amenable number.

2117912505 is a deficient number, since it is larger than the sum of its proper divisors (1271495559).

2117912505 is a wasteful number, since it uses less digits than its factorization.

2117912505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31176.

The product of its (nonzero) digits is 6300, while the sum is 33.

The square root of 2117912505 is about 46020.7834027193. The cubic root of 2117912505 is about 1284.2098742493.

The spelling of 2117912505 in words is "two billion, one hundred seventeen million, nine hundred twelve thousand, five hundred five".