1291320754523 has 4 divisors (see below), whose sum is σ = 1291327221048. Its totient is φ = 1291314288000.

The previous prime is 1291320754483. The next prime is 1291320754547. The reversal of 1291320754523 is 3254570231921.

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

It is a cyclic number.

It is not a de Polignac number, because 1291320754523 - 2²⁴ = 1291303977307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1291320754223) 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, 2923853 + ... + 3336398.

It is an arithmetic number, because the mean of its divisors is an integer number (322831805262).

Almost surely, 2^{1291320754523} is an apocalyptic number.

1291320754523 is a deficient number, since it is larger than the sum of its proper divisors (6466525).

1291320754523 is an equidigital number, since it uses as much as digits as its factorization.

1291320754523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6466524.

The product of its (nonzero) digits is 453600, while the sum is 44.

The spelling of 1291320754523 in words is "one trillion, two hundred ninety-one billion, three hundred twenty million, seven hundred fifty-four thousand, five hundred twenty-three".