2117837851 has 4 divisors (see below), whose sum is σ = 2126275704. Its totient is φ = 2109400000.

The previous prime is 2117837809. The next prime is 2117837893. The reversal of 2117837851 is 1587387112.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (2117837809) and next prime (2117837893).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2117837851 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2117837798 and 2117837807.

It is not an unprimeable number, because it can be changed into a prime (2117837251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4218550 + ... + 4219051.

It is an arithmetic number, because the mean of its divisors is an integer number (531568926).

Almost surely, 2^2117837851 is an apocalyptic number.

2117837851 is a deficient number, since it is larger than the sum of its proper divisors (8437853).

2117837851 is an equidigital number, since it uses as much as digits as its factorization.

2117837851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8437852.

The product of its digits is 94080, while the sum is 43.

The square root of 2117837851 is about 46019.9723055110. The cubic root of 2117837851 is about 1284.1947850942.

The spelling of 2117837851 in words is "two billion, one hundred seventeen million, eight hundred thirty-seven thousand, eight hundred fifty-one".