3131731 has 4 divisors (see below), whose sum is σ = 3138264. Its totient is φ = 3125200.

The previous prime is 3131701. The next prime is 3131743. The reversal of 3131731 is 1371313.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1371313 = 43 ⋅31891.

It is a cyclic number.

It is not a de Polignac number, because 3131731 - 2⁵ = 3131699 is a prime.

It is a super-2 number, since 2×3131731² = 19615478112722, which contains 22 as substring.

It is a Duffinian number.

3131731 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 3131699 and 3131708.

It is not an unprimeable number, because it can be changed into a prime (3131701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2485 + ... + 3526.

It is an arithmetic number, because the mean of its divisors is an integer number (784566).

Almost surely, 2^3131731 is an apocalyptic number.

3131731 is a deficient number, since it is larger than the sum of its proper divisors (6533).

3131731 is an equidigital number, since it uses as much as digits as its factorization.

3131731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6532.

The product of its digits is 189, while the sum is 19.

The square root of 3131731 is about 1769.6697432007. The cubic root of 3131731 is about 146.3057799743.

The spelling of 3131731 in words is "three million, one hundred thirty-one thousand, seven hundred thirty-one".