2381656181309 has 2 divisors, whose sum is σ = 2381656181310. Its totient is φ = 2381656181308.

The previous prime is 2381656181249. The next prime is 2381656181363. The reversal of 2381656181309 is 9031816561832.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2334035340025 + 47620841284 = 1527755^2 + 218222^2 .

It is a cyclic number.

It is not a de Polignac number, because 2381656181309 - 2²⁴ = 2381639404093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2381656181369) 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, 1190828090654 + 1190828090655.

It is an arithmetic number, because the mean of its divisors is an integer number (1190828090655).

Almost surely, 2^{2381656181309} is an apocalyptic number.

It is an amenable number.

2381656181309 is a deficient number, since it is larger than the sum of its proper divisors (1).

2381656181309 is an equidigital number, since it uses as much as digits as its factorization.

2381656181309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1866240, while the sum is 53.

The spelling of 2381656181309 in words is "two trillion, three hundred eighty-one billion, six hundred fifty-six million, one hundred eighty-one thousand, three hundred nine".