1273893930521 has 2 divisors, whose sum is σ = 1273893930522. Its totient is φ = 1273893930520.

The previous prime is 1273893930499. The next prime is 1273893930553. The reversal of 1273893930521 is 1250393983721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 641016403225 + 632877527296 = 800635^2 + 795536^2 .

It is an emirp because it is prime and its reverse (1250393983721) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1273893930521 is a prime.

It is not a weakly prime, because it can be changed into another prime (1273893980521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 636946965260 + 636946965261.

It is an arithmetic number, because the mean of its divisors is an integer number (636946965261).

Almost surely, 2^{1273893930521} is an apocalyptic number.

It is an amenable number.

1273893930521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1273893930521 is an equidigital number, since it uses as much as digits as its factorization.

1273893930521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2449440, while the sum is 53.

The spelling of 1273893930521 in words is "one trillion, two hundred seventy-three billion, eight hundred ninety-three million, nine hundred thirty thousand, five hundred twenty-one".