3138621397 has 2 divisors, whose sum is σ = 3138621398. Its totient is φ = 3138621396.

The previous prime is 3138621389. The next prime is 3138621491. The reversal of 3138621397 is 7931268313.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2998767121 + 139854276 = 54761^2 + 11826^2 .

It is a cyclic number.

It is not a de Polignac number, because 3138621397 - 2³ = 3138621389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3138621347) 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, 1569310698 + 1569310699.

It is an arithmetic number, because the mean of its divisors is an integer number (1569310699).

Almost surely, 2^3138621397 is an apocalyptic number.

It is an amenable number.

3138621397 is a deficient number, since it is larger than the sum of its proper divisors (1).

3138621397 is an equidigital number, since it uses as much as digits as its factorization.

3138621397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 43.

The square root of 3138621397 is about 56023.4004412442. The cubic root of 3138621397 is about 1464.1300145129.

The spelling of 3138621397 in words is "three billion, one hundred thirty-eight million, six hundred twenty-one thousand, three hundred ninety-seven".