3121009 has 4 divisors (see below), whose sum is σ = 3228660. Its totient is φ = 3013360.

The previous prime is 3121007. The next prime is 3121033. The reversal of 3121009 is 9001213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9001213 = 13 ⋅692401.

It can be written as a sum of positive squares in 2 ways, for example, as 1904400 + 1216609 = 1380^2 + 1103^2 .

It is a cyclic number.

It is not a de Polignac number, because 3121009 - 2¹ = 3121007 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3120983 and 3121001.

It is not an unprimeable number, because it can be changed into a prime (3121007) 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, 53782 + ... + 53839.

It is an arithmetic number, because the mean of its divisors is an integer number (807165).

Almost surely, 2^3121009 is an apocalyptic number.

It is an amenable number.

3121009 is a deficient number, since it is larger than the sum of its proper divisors (107651).

3121009 is a wasteful number, since it uses less digits than its factorization.

3121009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107650.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 3121009 is about 1766.6377670592. The cubic root of 3121009 is about 146.1386217042.

The spelling of 3121009 in words is "three million, one hundred twenty-one thousand, nine".