1291830008569 has 3 divisors (see below), whose sum is σ = 1291831145157. Its totient is φ = 1291828871982.

The previous prime is 1291830008509. The next prime is 1291830008597. The reversal of 1291830008569 is 9658000381921.

The square root of 1291830008569 is 1136587.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 1291830008569 - 2²³ = 1291821619961 is a prime.

It is a super-2 number, since 2×1291830008569² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1291830008509) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 568294 + ... + 1704880.

It is an arithmetic number, because the mean of its divisors is an integer number (430610381719).

Almost surely, 2^{1291830008569} is an apocalyptic number.

1291830008569 is the 1136587-th square number.

1291830008569 is the 568294-th centered octagonal number.

It is an amenable number.

1291830008569 is a deficient number, since it is larger than the sum of its proper divisors (1136588).

1291830008569 is an frugal number, since it uses more digits than its factorization.

1291830008569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2273174 (or 1136587 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 52.

The spelling of 1291830008569 in words is "one trillion, two hundred ninety-one billion, eight hundred thirty million, eight thousand, five hundred sixty-nine".