3123189778939 has 2 divisors, whose sum is σ = 3123189778940. Its totient is φ = 3123189778938.

The previous prime is 3123189778937. The next prime is 3123189778993. The reversal of 3123189778939 is 9398779813213.

Together with next prime (3123189778993) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3123189778939 - 2¹ = 3123189778937 is a prime.

Together with 3123189778937, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (3123189778937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1561594889469 + 1561594889470.

It is an arithmetic number, because the mean of its divisors is an integer number (1561594889470).

Almost surely, 2^{3123189778939} is an apocalyptic number.

3123189778939 is a deficient number, since it is larger than the sum of its proper divisors (1).

3123189778939 is an equidigital number, since it uses as much as digits as its factorization.

3123189778939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 123451776, while the sum is 70.

The spelling of 3123189778939 in words is "three trillion, one hundred twenty-three billion, one hundred eighty-nine million, seven hundred seventy-eight thousand, nine hundred thirty-nine".