2117718949 has 6 divisors (see below), whose sum is σ = 2127666290. Its totient is φ = 2107777920.

The previous prime is 2117718947. The next prime is 2117718989. The reversal of 2117718949 is 9498177112.

It can be written as a sum of positive squares in 3 ways, for example, as 1958505025 + 159213924 = 44255^2 + 12618^2 .

It is not a de Polignac number, because 2117718949 - 2¹ = 2117718947 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 (2117718947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 694869 + ... + 697909.

Almost surely, 2^2117718949 is an apocalyptic number.

It is an amenable number.

2117718949 is a deficient number, since it is larger than the sum of its proper divisors (9947341).

2117718949 is an frugal number, since it uses more digits than its factorization.

2117718949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6311 (or 3270 counting only the distinct ones).

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

The square root of 2117718949 is about 46018.6804352320. The cubic root of 2117718949 is about 1284.1707517488.

The spelling of 2117718949 in words is "two billion, one hundred seventeen million, seven hundred eighteen thousand, nine hundred forty-nine".