1388632891273 has 2 divisors, whose sum is σ = 1388632891274. Its totient is φ = 1388632891272.

The previous prime is 1388632891253. The next prime is 1388632891339. The reversal of 1388632891273 is 3721982368831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1142564312464 + 246068578809 = 1068908^2 + 496053^2 .

It is a cyclic number.

It is not a de Polignac number, because 1388632891273 - 2²⁹ = 1388096020361 is a prime.

It is a super-2 number, since 2×1388632891273² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1388632891213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694316445636 + 694316445637.

It is an arithmetic number, because the mean of its divisors is an integer number (694316445637).

Almost surely, 2^{1388632891273} is an apocalyptic number.

It is an amenable number.

1388632891273 is a deficient number, since it is larger than the sum of its proper divisors (1).

1388632891273 is an equidigital number, since it uses as much as digits as its factorization.

1388632891273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20901888, while the sum is 61.

The spelling of 1388632891273 in words is "one trillion, three hundred eighty-eight billion, six hundred thirty-two million, eight hundred ninety-one thousand, two hundred seventy-three".