3121857 has 6 divisors (see below), whose sum is σ = 4509362. Its totient is φ = 2081232.

The previous prime is 3121841. The next prime is 3121873. The reversal of 3121857 is 7581213.

3121857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (3121841) and next prime (3121873).

It can be written as a sum of positive squares in only one way, i.e., 3101121 + 20736 = 1761^2 + 144^2 .

It is not a de Polignac number, because 3121857 - 2⁴ = 3121841 is a prime.

It is a super-2 number, since 2×3121857² = 19491982256898, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3121857.

It is not an unprimeable number, because it can be changed into a prime (3121817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 173428 + ... + 173445.

Almost surely, 2^3121857 is an apocalyptic number.

It is an amenable number.

3121857 is a deficient number, since it is larger than the sum of its proper divisors (1387505).

3121857 is a wasteful number, since it uses less digits than its factorization.

3121857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346879 (or 346876 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 3121857 is about 1766.8777546848. The cubic root of 3121857 is about 146.1518561346.

The spelling of 3121857 in words is "three million, one hundred twenty-one thousand, eight hundred fifty-seven".