3121409 has 2 divisors, whose sum is σ = 3121410. Its totient is φ = 3121408.

The previous prime is 3121379. The next prime is 3121423. The reversal of 3121409 is 9041213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3073009 + 48400 = 1753^2 + 220^2 .

It is a cyclic number.

It is not a de Polignac number, because 3121409 - 2¹⁶ = 3055873 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (3121429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1560704 + 1560705.

It is an arithmetic number, because the mean of its divisors is an integer number (1560705).

Almost surely, 2^3121409 is an apocalyptic number.

It is an amenable number.

3121409 is a deficient number, since it is larger than the sum of its proper divisors (1).

3121409 is an equidigital number, since it uses as much as digits as its factorization.

3121409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 3121409 is about 1766.7509728312. The cubic root of 3121409 is about 146.1448646587.

The spelling of 3121409 in words is "three million, one hundred twenty-one thousand, four hundred nine".