3139809121 has 2 divisors, whose sum is σ = 3139809122. Its totient is φ = 3139809120.

The previous prime is 3139809089. The next prime is 3139809161. The reversal of 3139809121 is 1219089313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2095808400 + 1044000721 = 45780^2 + 32311^2 .

It is a cyclic number.

It is not a de Polignac number, because 3139809121 - 2⁵ = 3139809089 is a prime.

It is not a weakly prime, because it can be changed into another prime (3139809161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1569904560 + 1569904561.

It is an arithmetic number, because the mean of its divisors is an integer number (1569904561).

Almost surely, 2^3139809121 is an apocalyptic number.

It is an amenable number.

3139809121 is a deficient number, since it is larger than the sum of its proper divisors (1).

3139809121 is an equidigital number, since it uses as much as digits as its factorization.

3139809121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 3139809121 is about 56033.9996876896. Note that the first 3 decimals coincide. The cubic root of 3139809121 is about 1464.3146776529.

The spelling of 3139809121 in words is "three billion, one hundred thirty-nine million, eight hundred nine thousand, one hundred twenty-one".