3123021389 has 2 divisors, whose sum is σ = 3123021390. Its totient is φ = 3123021388.

The previous prime is 3123021379. The next prime is 3123021427. The reversal of 3123021389 is 9831203213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2868459364 + 254562025 = 53558^2 + 15955^2 .

It is a cyclic number.

It is not a de Polignac number, because 3123021389 - 2⁸ = 3123021133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3123021359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1561510694 + 1561510695.

It is an arithmetic number, because the mean of its divisors is an integer number (1561510695).

Almost surely, 2^3123021389 is an apocalyptic number.

It is an amenable number.

3123021389 is a deficient number, since it is larger than the sum of its proper divisors (1).

3123021389 is an equidigital number, since it uses as much as digits as its factorization.

3123021389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 3123021389 is about 55883.9994005440. Note that the first 3 decimals coincide. The cubic root of 3123021389 is about 1461.7002442995.

The spelling of 3123021389 in words is "three billion, one hundred twenty-three million, twenty-one thousand, three hundred eighty-nine".