1306431431161 has 4 divisors (see below), whose sum is σ = 1306965324672. Its totient is φ = 1305897537652.

The previous prime is 1306431431159. The next prime is 1306431431177. The reversal of 1306431431161 is 1611341346031.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1306431431161 - 2¹ = 1306431431159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1306431431131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 266943085 + ... + 266947978.

It is an arithmetic number, because the mean of its divisors is an integer number (326741331168).

Almost surely, 2^{1306431431161} is an apocalyptic number.

It is an amenable number.

1306431431161 is a deficient number, since it is larger than the sum of its proper divisors (533893511).

1306431431161 is an equidigital number, since it uses as much as digits as its factorization.

1306431431161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533893510.

The product of its (nonzero) digits is 15552, while the sum is 34.

Adding to 1306431431161 its reverse (1611341346031), we get a palindrome (2917772777192).

The spelling of 1306431431161 in words is "one trillion, three hundred six billion, four hundred thirty-one million, four hundred thirty-one thousand, one hundred sixty-one".