3131681 has 8 divisors (see below), whose sum is σ = 3702720. Its totient is φ = 2591568.

The previous prime is 3131671. The next prime is 3131699. The reversal of 3131681 is 1861313.

3131681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a de Polignac number, because none of the positive numbers 2^k-3131681 is a prime.

It is a super-2 number, since 2×3131681² = 19614851771522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3131641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7511 + ... + 7916.

It is an arithmetic number, because the mean of its divisors is an integer number (462840).

Almost surely, 2^3131681 is an apocalyptic number.

It is an amenable number.

3131681 is a deficient number, since it is larger than the sum of its proper divisors (571039).

3131681 is a wasteful number, since it uses less digits than its factorization.

3131681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15463.

The product of its digits is 432, while the sum is 23.

The square root of 3131681 is about 1769.6556162146. The cubic root of 3131681 is about 146.3050013498.

Adding to 3131681 its reverse (1861313), we get a palindrome (4992994).

The spelling of 3131681 in words is "three million, one hundred thirty-one thousand, six hundred eighty-one".