2117240391 has 16 divisors (see below), whose sum is σ = 3227102208. Its totient is φ = 1209540000.

The previous prime is 2117240371. The next prime is 2117240453. The reversal of 2117240391 is 1930427112.

2117240391 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2117240391 - 2¹⁵ = 2117207623 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2117240341) 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, 89161 + ... + 110381.

It is an arithmetic number, because the mean of its divisors is an integer number (201693888).

Almost surely, 2^2117240391 is an apocalyptic number.

2117240391 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2117240391 is a deficient number, since it is larger than the sum of its proper divisors (1109861817).

2117240391 is a wasteful number, since it uses less digits than its factorization.

2117240391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25982.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 2117240391 is about 46013.4805355996. The cubic root of 2117240391 is about 1284.0740129937.

The spelling of 2117240391 in words is "two billion, one hundred seventeen million, two hundred forty thousand, three hundred ninety-one".