3121031213 has 2 divisors, whose sum is σ = 3121031214. Its totient is φ = 3121031212.

The previous prime is 3121031201. The next prime is 3121031227. The reversal of 3121031213 is 3121301213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2590097449 + 530933764 = 50893^2 + 23042^2 .

It is a cyclic number.

It is not a de Polignac number, because 3121031213 - 2⁶ = 3121031149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3121031191 and 3121031200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3121031813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1560515606 + 1560515607.

It is an arithmetic number, because the mean of its divisors is an integer number (1560515607).

Almost surely, 2^3121031213 is an apocalyptic number.

It is an amenable number.

3121031213 is a deficient number, since it is larger than the sum of its proper divisors (1).

3121031213 is an equidigital number, since it uses as much as digits as its factorization.

3121031213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 3121031213 is about 55866.1902495597. The cubic root of 3121031213 is about 1461.3896840503.

Adding to 3121031213 its reverse (3121301213), we get a palindrome (6242332426).

The spelling of 3121031213 in words is "three billion, one hundred twenty-one million, thirty-one thousand, two hundred thirteen".