2168431931 has 8 divisors (see below), whose sum is σ = 2200542144. Its totient is φ = 2136386880.

The previous prime is 2168431913. The next prime is 2168431949. The reversal of 2168431931 is 1391348612.

It is an interprime number because it is at equal distance from previous prime (2168431913) and next prime (2168431949).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2168431931 is a prime.

It is a super-3 number, since 3×2168431931³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2168431901) 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, 52910 + ... + 84476.

It is an arithmetic number, because the mean of its divisors is an integer number (275067768).

Almost surely, 2^2168431931 is an apocalyptic number.

2168431931 is a deficient number, since it is larger than the sum of its proper divisors (32110213).

2168431931 is an equidigital number, since it uses as much as digits as its factorization.

2168431931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32581.

The product of its digits is 31104, while the sum is 38.

The square root of 2168431931 is about 46566.4249325627. The cubic root of 2168431931 is about 1294.3406712126.

The spelling of 2168431931 in words is "two billion, one hundred sixty-eight million, four hundred thirty-one thousand, nine hundred thirty-one".