3121213 has 4 divisors (see below), whose sum is σ = 3124800. Its totient is φ = 3117628.

The previous prime is 3121201. The next prime is 3121219.

3121213 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 3121213 - 2²¹ = 1024061 is a prime.

It is a Duffinian number.

3121213 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 3121193 and 3121202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3121219) 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, 438 + ... + 2536.

It is an arithmetic number, because the mean of its divisors is an integer number (781200).

Almost surely, 2^3121213 is an apocalyptic number.

It is an amenable number.

3121213 is a deficient number, since it is larger than the sum of its proper divisors (3587).

3121213 is a wasteful number, since it uses less digits than its factorization.

3121213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3586.

The product of its digits is 36, while the sum is 13.

The square root of 3121213 is about 1766.6955029093. The cubic root of 3121213 is about 146.1418056776.

The spelling of 3121213 in words is "three million, one hundred twenty-one thousand, two hundred thirteen".