3160721 has 4 divisors (see below), whose sum is σ = 3183600. Its totient is φ = 3137844.

The previous prime is 3160709. The next prime is 3160741. The reversal of 3160721 is 1270613.

It is a happy number.

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 an emirpimes, since its reverse is a distinct semiprime: 1270613 = 109 ⋅11657.

It is a cyclic number.

It is not a de Polignac number, because 3160721 - 2¹⁰ = 3159697 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3160693 and 3160702.

It is not an unprimeable number, because it can be changed into a prime (3160741) 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, 11231 + ... + 11508.

It is an arithmetic number, because the mean of its divisors is an integer number (795900).

Almost surely, 2^3160721 is an apocalyptic number.

It is an amenable number.

3160721 is a deficient number, since it is larger than the sum of its proper divisors (22879).

3160721 is a wasteful number, since it uses less digits than its factorization.

3160721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22878.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 3160721 is about 1777.8416689908. The cubic root of 3160721 is about 146.7558382210.

The spelling of 3160721 in words is "three million, one hundred sixty thousand, seven hundred twenty-one".