1291218563023 has 4 divisors (see below), whose sum is σ = 1367172596160. Its totient is φ = 1215264529888.

The previous prime is 1291218563009. The next prime is 1291218563039. The reversal of 1291218563023 is 3203658121921.

It is a happy number.

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 1291218563023 - 2¹³ = 1291218554831 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 (1291218563053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37977016543 + ... + 37977016576.

It is an arithmetic number, because the mean of its divisors is an integer number (341793149040).

Almost surely, 2^{1291218563023} is an apocalyptic number.

1291218563023 is a deficient number, since it is larger than the sum of its proper divisors (75954033137).

1291218563023 is an equidigital number, since it uses as much as digits as its factorization.

1291218563023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75954033136.

The product of its (nonzero) digits is 155520, while the sum is 43.

The spelling of 1291218563023 in words is "one trillion, two hundred ninety-one billion, two hundred eighteen million, five hundred sixty-three thousand, twenty-three".