1291500551623 has 8 divisors (see below), whose sum is σ = 1294803163008. Its totient is φ = 1288202147064.

The previous prime is 1291500551597. The next prime is 1291500551633. The reversal of 1291500551623 is 3261550051921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1291500551623 - 2⁹ = 1291500551111 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 (1291500551633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 436461 + ... + 1665382.

It is an arithmetic number, because the mean of its divisors is an integer number (161850395376).

Almost surely, 2^{1291500551623} is an apocalyptic number.

1291500551623 is a deficient number, since it is larger than the sum of its proper divisors (3302611385).

1291500551623 is an equidigital number, since it uses as much as digits as its factorization.

1291500551623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2103413.

The product of its (nonzero) digits is 81000, while the sum is 40.

The spelling of 1291500551623 in words is "one trillion, two hundred ninety-one billion, five hundred million, five hundred fifty-one thousand, six hundred twenty-three".