3131885 has 4 divisors (see below), whose sum is σ = 3758268. Its totient is φ = 2505504.

The previous prime is 3131879. The next prime is 3131911. The reversal of 3131885 is 5881313.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1394761 + 1737124 = 1181^2 + 1318^2 .

It is a cyclic number.

It is not a de Polignac number, because 3131885 - 2⁸ = 3131629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 313184 + ... + 313193.

It is an arithmetic number, because the mean of its divisors is an integer number (939567).

Almost surely, 2^3131885 is an apocalyptic number.

It is an amenable number.

3131885 is a deficient number, since it is larger than the sum of its proper divisors (626383).

3131885 is an equidigital number, since it uses as much as digits as its factorization.

3131885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626382.

The product of its digits is 2880, while the sum is 29.

The square root of 3131885 is about 1769.7132536092. The cubic root of 3131885 is about 146.3081780859.

The spelling of 3131885 in words is "three million, one hundred thirty-one thousand, eight hundred eighty-five".