1272691981357 has 2 divisors, whose sum is σ = 1272691981358. Its totient is φ = 1272691981356.

The previous prime is 1272691981289. The next prime is 1272691981411. The reversal of 1272691981357 is 7531891962721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1260172385476 + 12519595881 = 1122574^2 + 111891^2 .

It is a cyclic number.

It is not a de Polignac number, because 1272691981357 - 2¹⁵ = 1272691948589 is a prime.

It is a super-2 number, since 2×1272691981357² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1272691981295 and 1272691981304.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1272691982357) 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, 636345990678 + 636345990679.

It is an arithmetic number, because the mean of its divisors is an integer number (636345990679).

Almost surely, 2^{1272691981357} is an apocalyptic number.

It is an amenable number.

1272691981357 is a deficient number, since it is larger than the sum of its proper divisors (1).

1272691981357 is an equidigital number, since it uses as much as digits as its factorization.

1272691981357 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11430720, while the sum is 61.

The spelling of 1272691981357 in words is "one trillion, two hundred seventy-two billion, six hundred ninety-one million, nine hundred eighty-one thousand, three hundred fifty-seven".