1321539261131 has 2 divisors, whose sum is σ = 1321539261132. Its totient is φ = 1321539261130.

The previous prime is 1321539261109. The next prime is 1321539261253. The reversal of 1321539261131 is 1311629351231.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1321539261131 - 2¹⁴ = 1321539244747 is a prime.

It is a super-2 number, since 2×1321539261131² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1321539261101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660769630565 + 660769630566.

It is an arithmetic number, because the mean of its divisors is an integer number (660769630566).

Almost surely, 2^{1321539261131} is an apocalyptic number.

1321539261131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321539261131 is an equidigital number, since it uses as much as digits as its factorization.

1321539261131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29160, while the sum is 38.

The spelling of 1321539261131 in words is "one trillion, three hundred twenty-one billion, five hundred thirty-nine million, two hundred sixty-one thousand, one hundred thirty-one".