1213131023281 has 2 divisors, whose sum is σ = 1213131023282. Its totient is φ = 1213131023280.

The previous prime is 1213131023233. The next prime is 1213131023359. The reversal of 1213131023281 is 1823201313121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1089215759025 + 123915264256 = 1043655^2 + 352016^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213131023281 - 2²³ = 1213122634673 is a prime.

It is a super-2 number, since 2×1213131023281² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1213131023201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606565511640 + 606565511641.

It is an arithmetic number, because the mean of its divisors is an integer number (606565511641).

Almost surely, 2^{1213131023281} is an apocalyptic number.

It is an amenable number.

1213131023281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213131023281 is an equidigital number, since it uses as much as digits as its factorization.

1213131023281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The spelling of 1213131023281 in words is "one trillion, two hundred thirteen billion, one hundred thirty-one million, twenty-three thousand, two hundred eighty-one".