3139198921 has 2 divisors, whose sum is σ = 3139198922. Its totient is φ = 3139198920.

The previous prime is 3139198919. The next prime is 3139198939. The reversal of 3139198921 is 1298919313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1904449600 + 1234749321 = 43640^2 + 35139^2 .

It is a cyclic number.

It is not a de Polignac number, because 3139198921 - 2¹ = 3139198919 is a prime.

Together with 3139198919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (3139198991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1569599460 + 1569599461.

It is an arithmetic number, because the mean of its divisors is an integer number (1569599461).

Almost surely, 2^3139198921 is an apocalyptic number.

It is an amenable number.

3139198921 is a deficient number, since it is larger than the sum of its proper divisors (1).

3139198921 is an equidigital number, since it uses as much as digits as its factorization.

3139198921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 104976, while the sum is 46.

The square root of 3139198921 is about 56028.5545146401. The cubic root of 3139198921 is about 1464.2198117262.

The spelling of 3139198921 in words is "three billion, one hundred thirty-nine million, one hundred ninety-eight thousand, nine hundred twenty-one".