3121109 has 2 divisors, whose sum is σ = 3121110. Its totient is φ = 3121108.

The previous prime is 3121091. The next prime is 3121121. The reversal of 3121109 is 9011213.

It is a happy number.

Together with previous prime (3121091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2900209 + 220900 = 1703^2 + 470^2 .

It is an emirp because it is prime and its reverse (9011213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3121109 - 2¹² = 3117013 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3121189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1560554 + 1560555.

It is an arithmetic number, because the mean of its divisors is an integer number (1560555).

Almost surely, 2^3121109 is an apocalyptic number.

It is an amenable number.

3121109 is a deficient number, since it is larger than the sum of its proper divisors (1).

3121109 is an equidigital number, since it uses as much as digits as its factorization.

3121109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 3121109 is about 1766.6660691823. Note that the first 3 decimals coincide. The cubic root of 3121109 is about 146.1401824928.

The spelling of 3121109 in words is "three million, one hundred twenty-one thousand, one hundred nine".