1291082274478 has 4 divisors (see below), whose sum is σ = 1936623411720. Its totient is φ = 645541137238.

The previous prime is 1291082274451. The next prime is 1291082274491. The reversal of 1291082274478 is 8744722801921.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 322770568618 + ... + 322770568621.

It is an arithmetic number, because the mean of its divisors is an integer number (484155852930).

Almost surely, 2^{1291082274478} is an apocalyptic number.

1291082274478 is a deficient number, since it is larger than the sum of its proper divisors (645541137242).

1291082274478 is an equidigital number, since it uses as much as digits as its factorization.

1291082274478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645541137241.

The product of its (nonzero) digits is 3612672, while the sum is 55.

The spelling of 1291082274478 in words is "one trillion, two hundred ninety-one billion, eighty-two million, two hundred seventy-four thousand, four hundred seventy-eight".