1291296538789 has 4 divisors (see below), whose sum is σ = 1291468558624. Its totient is φ = 1291124518956.

The previous prime is 1291296538787. The next prime is 1291296538817. The reversal of 1291296538789 is 9878356921921.

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 1291296538789 - 2¹ = 1291296538787 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291296538781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85998657 + ... + 86013670.

It is an arithmetic number, because the mean of its divisors is an integer number (322867139656).

Almost surely, 2^{1291296538789} is an apocalyptic number.

It is an amenable number.

1291296538789 is a deficient number, since it is larger than the sum of its proper divisors (172019835).

1291296538789 is an equidigital number, since it uses as much as digits as its factorization.

1291296538789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172019834.

The product of its digits is 117573120, while the sum is 70.

The spelling of 1291296538789 in words is "one trillion, two hundred ninety-one billion, two hundred ninety-six million, five hundred thirty-eight thousand, seven hundred eighty-nine".