2182681781 has 24 divisors (see below), whose sum is σ = 2646780864. Its totient is φ = 1762104960.

The previous prime is 2182681769. The next prime is 2182681801. The reversal of 2182681781 is 1871862812.

It is not a de Polignac number, because 2182681781 - 2¹⁰ = 2182680757 is a prime.

It is a super-2 number, since 2×2182681781² = 9528199514218663922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2182681741) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 236846 + ... + 245888.

It is an arithmetic number, because the mean of its divisors is an integer number (110282536).

Almost surely, 2^2182681781 is an apocalyptic number.

It is an amenable number.

2182681781 is a deficient number, since it is larger than the sum of its proper divisors (464099083).

2182681781 is an equidigital number, since it uses as much as digits as its factorization.

2182681781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9149 (or 9120 counting only the distinct ones).

The product of its digits is 86016, while the sum is 44.

The square root of 2182681781 is about 46719.1800120678. The cubic root of 2182681781 is about 1297.1697363197.

The spelling of 2182681781 in words is "two billion, one hundred eighty-two million, six hundred eighty-one thousand, seven hundred eighty-one".