2831661381 has 4 divisors (see below), whose sum is σ = 3775548512. Its totient is φ = 1887774252.

The previous prime is 2831661379. The next prime is 2831661403. The reversal of 2831661381 is 1831661382.

2831661381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2831661381 - 2¹ = 2831661379 is a prime.

It is a super-3 number, since 3×2831661381³ (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 a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2831661331) 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, 471943561 + ... + 471943566.

It is an arithmetic number, because the mean of its divisors is an integer number (943887128).

Almost surely, 2^2831661381 is an apocalyptic number.

It is an amenable number.

2831661381 is a deficient number, since it is larger than the sum of its proper divisors (943887131).

2831661381 is an equidigital number, since it uses as much as digits as its factorization.

2831661381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 943887130.

The product of its digits is 41472, while the sum is 39.

The square root of 2831661381 is about 53213.3571671625. The cubic root of 2831661381 is about 1414.7523997506.

Subtracting from 2831661381 its reverse (1831661382), we obtain a palindrome (999999999).

The spelling of 2831661381 in words is "two billion, eight hundred thirty-one million, six hundred sixty-one thousand, three hundred eighty-one".