2117928249 has 8 divisors (see below), whose sum is σ = 3137671520. Its totient is φ = 1411952148.

The previous prime is 2117928229. The next prime is 2117928257. The reversal of 2117928249 is 9428297112.

It is not a de Polignac number, because 2117928249 - 2⁷ = 2117928121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2117928229) 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 7 ways as a sum of consecutive naturals, for example, 39220867 + ... + 39220920.

It is an arithmetic number, because the mean of its divisors is an integer number (392208940).

Almost surely, 2^2117928249 is an apocalyptic number.

It is an amenable number.

2117928249 is a deficient number, since it is larger than the sum of its proper divisors (1019743271).

2117928249 is an equidigital number, since it uses as much as digits as its factorization.

2117928249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78441796 (or 78441790 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 2117928249 is about 46020.9544555521. The cubic root of 2117928249 is about 1284.2130564000.

The spelling of 2117928249 in words is "two billion, one hundred seventeen million, nine hundred twenty-eight thousand, two hundred forty-nine".