3121849 has 4 divisors (see below), whose sum is σ = 3126564. Its totient is φ = 3117136.

The previous prime is 3121841. The next prime is 3121873. The reversal of 3121849 is 9481213.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2050624 + 1071225 = 1432^2 + 1035^2 .

It is a cyclic number.

It is not a de Polignac number, because 3121849 - 2³ = 3121841 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3121841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1162 + ... + 2755.

It is an arithmetic number, because the mean of its divisors is an integer number (781641).

Almost surely, 2^3121849 is an apocalyptic number.

It is an amenable number.

3121849 is a deficient number, since it is larger than the sum of its proper divisors (4715).

3121849 is an equidigital number, since it uses as much as digits as its factorization.

3121849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4714.

The product of its digits is 1728, while the sum is 28.

The square root of 3121849 is about 1766.8754908029. The cubic root of 3121849 is about 146.1517312926.

The spelling of 3121849 in words is "three million, one hundred twenty-one thousand, eight hundred forty-nine".