3131729 has 4 divisors (see below), whose sum is σ = 3135984. Its totient is φ = 3127476.

The previous prime is 3131701. The next prime is 3131743. The reversal of 3131729 is 9271313.

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 a cyclic number.

It is not a de Polignac number, because 3131729 - 2¹² = 3127633 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3131698 and 3131707.

It is not an unprimeable number, because it can be changed into a prime (3131329) 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, 707 + ... + 2600.

It is an arithmetic number, because the mean of its divisors is an integer number (783996).

Almost surely, 2^3131729 is an apocalyptic number.

It is an amenable number.

3131729 is a deficient number, since it is larger than the sum of its proper divisors (4255).

3131729 is an equidigital number, since it uses as much as digits as its factorization.

3131729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4254.

The product of its digits is 1134, while the sum is 26.

The square root of 3131729 is about 1769.6691781234. The cubic root of 3131729 is about 146.3057488295.

The spelling of 3131729 in words is "three million, one hundred thirty-one thousand, seven hundred twenty-nine".