2831681 has 6 divisors (see below), whose sum is σ = 2882646. Its totient is φ = 2781600.

The previous prime is 2831677. The next prime is 2831683. The reversal of 2831681 is 1861382.

It can be written as a sum of positive squares in 3 ways, for example, as 846400 + 1985281 = 920^2 + 1409^2 .

It is not a de Polignac number, because 2831681 - 2² = 2831677 is a prime.

It is a super-2 number, since 2×2831681² = 16036834571522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2831683) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3341 + ... + 4101.

It is an arithmetic number, because the mean of its divisors is an integer number (480441).

2^2831681 is an apocalyptic number.

It is an amenable number.

2831681 is a deficient number, since it is larger than the sum of its proper divisors (50965).

2831681 is an frugal number, since it uses more digits than its factorization.

2831681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 883 (or 822 counting only the distinct ones).

The product of its digits is 2304, while the sum is 29.

The square root of 2831681 is about 1682.7599353443. The cubic root of 2831681 is about 141.4755667086.

Subtracting from 2831681 its reverse (1861382), we obtain a cube (970299 = 99³).

The spelling of 2831681 in words is "two million, eight hundred thirty-one thousand, six hundred eighty-one".