3161729 has 4 divisors (see below), whose sum is σ = 3165360. Its totient is φ = 3158100.

The previous prime is 3161707. The next prime is 3161749. The reversal of 3161729 is 9271613.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3161729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3161749) 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, 362 + ... + 2540.

It is an arithmetic number, because the mean of its divisors is an integer number (791340).

Almost surely, 2^3161729 is an apocalyptic number.

It is an amenable number.

3161729 is a deficient number, since it is larger than the sum of its proper divisors (3631).

3161729 is a wasteful number, since it uses less digits than its factorization.

3161729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3630.

The product of its digits is 2268, while the sum is 29.

The square root of 3161729 is about 1778.1251362039. The cubic root of 3161729 is about 146.7714374215.

The spelling of 3161729 in words is "three million, one hundred sixty-one thousand, seven hundred twenty-nine".