2539278974189 has 2 divisors, whose sum is σ = 2539278974190. Its totient is φ = 2539278974188.

The previous prime is 2539278974161. The next prime is 2539278974227. The reversal of 2539278974189 is 9814798729352.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2014364234089 + 524914740100 = 1419283^2 + 724510^2 .

It is a cyclic number.

It is not a de Polignac number, because 2539278974189 - 2²⁴ = 2539262196973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2539278974129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1269639487094 + 1269639487095.

It is an arithmetic number, because the mean of its divisors is an integer number (1269639487095).

Almost surely, 2^{2539278974189} is an apocalyptic number.

It is an amenable number.

2539278974189 is a deficient number, since it is larger than the sum of its proper divisors (1).

2539278974189 is an equidigital number, since it uses as much as digits as its factorization.

2539278974189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 548674560, while the sum is 74.

The spelling of 2539278974189 in words is "two trillion, five hundred thirty-nine billion, two hundred seventy-eight million, nine hundred seventy-four thousand, one hundred eighty-nine".