1231288849321 has 2 divisors, whose sum is σ = 1231288849322. Its totient is φ = 1231288849320.

The previous prime is 1231288849303. The next prime is 1231288849537. The reversal of 1231288849321 is 1239488821321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 958842432025 + 272446417296 = 979205^2 + 521964^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231288849321 - 2⁵ = 1231288849289 is a prime.

It is a super-2 number, since 2×1231288849321² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1231288844321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615644424660 + 615644424661.

It is an arithmetic number, because the mean of its divisors is an integer number (615644424661).

Almost surely, 2^{1231288849321} is an apocalyptic number.

It is an amenable number.

1231288849321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231288849321 is an equidigital number, since it uses as much as digits as its factorization.

1231288849321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1327104, while the sum is 52.

The spelling of 1231288849321 in words is "one trillion, two hundred thirty-one billion, two hundred eighty-eight million, eight hundred forty-nine thousand, three hundred twenty-one".