1272837638381 has 2 divisors, whose sum is σ = 1272837638382. Its totient is φ = 1272837638380.

The previous prime is 1272837638353. The next prime is 1272837638393. The reversal of 1272837638381 is 1838367382721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1066934055625 + 205903582756 = 1032925^2 + 453766^2 .

It is a cyclic number.

It is not a de Polignac number, because 1272837638381 - 2¹⁴ = 1272837621997 is a prime.

It is a super-2 number, since 2×1272837638381² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1272837638381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1272837638881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 636418819190 + 636418819191.

It is an arithmetic number, because the mean of its divisors is an integer number (636418819191).

Almost surely, 2^{1272837638381} is an apocalyptic number.

It is an amenable number.

1272837638381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1272837638381 is an equidigital number, since it uses as much as digits as its factorization.

1272837638381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16257024, while the sum is 59.

The spelling of 1272837638381 in words is "one trillion, two hundred seventy-two billion, eight hundred thirty-seven million, six hundred thirty-eight thousand, three hundred eighty-one".