3106921 has 2 divisors, whose sum is σ = 3106922. Its totient is φ = 3106920.

The previous prime is 3106919. The next prime is 3106969. The reversal of 3106921 is 1296013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3080025 + 26896 = 1755^2 + 164^2 .

It is a cyclic number.

It is not a de Polignac number, because 3106921 - 2¹ = 3106919 is a prime.

Together with 3106919, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 3106892 and 3106901.

It is not a weakly prime, because it can be changed into another prime (3106981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1553460 + 1553461.

It is an arithmetic number, because the mean of its divisors is an integer number (1553461).

Almost surely, 2^3106921 is an apocalyptic number.

It is an amenable number.

3106921 is a deficient number, since it is larger than the sum of its proper divisors (1).

3106921 is an equidigital number, since it uses as much as digits as its factorization.

3106921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 3106921 is about 1762.6460223199. The cubic root of 3106921 is about 145.9184037712.

The spelling of 3106921 in words is "three million, one hundred six thousand, nine hundred twenty-one".