3138978951397 has 2 divisors, whose sum is σ = 3138978951398. Its totient is φ = 3138978951396.

The previous prime is 3138978951323. The next prime is 3138978951497. The reversal of 3138978951397 is 7931598798313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3138676400161 + 302551236 = 1771631^2 + 17394^2 .

It is an emirp because it is prime and its reverse (7931598798313) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3138978951397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3138978951497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1569489475698 + 1569489475699.

It is an arithmetic number, because the mean of its divisors is an integer number (1569489475699).

Almost surely, 2^{3138978951397} is an apocalyptic number.

It is an amenable number.

3138978951397 is a deficient number, since it is larger than the sum of its proper divisors (1).

3138978951397 is an equidigital number, since it uses as much as digits as its factorization.

3138978951397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 308629440, while the sum is 73.

The spelling of 3138978951397 in words is "three trillion, one hundred thirty-eight billion, nine hundred seventy-eight million, nine hundred fifty-one thousand, three hundred ninety-seven".