1291811823241 has 3 divisors (see below), whose sum is σ = 1291812959821. Its totient is φ = 1291810686662.

The previous prime is 1291811823233. The next prime is 1291811823287. The reversal of 1291811823241 is 1423281181921.

The square root of 1291811823241 is 1136579.

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 1291811823241 - 2³ = 1291811823233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1291811823041) 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, 568290 + ... + 1704868.

Almost surely, 2^{1291811823241} is an apocalyptic number.

1291811823241 is the 1136579-th square number.

1291811823241 is the 568290-th centered octagonal number.

It is an amenable number.

1291811823241 is a deficient number, since it is larger than the sum of its proper divisors (1136580).

1291811823241 is an frugal number, since it uses more digits than its factorization.

1291811823241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2273158 (or 1136579 counting only the distinct ones).

The product of its digits is 55296, while the sum is 43.

The spelling of 1291811823241 in words is "one trillion, two hundred ninety-one billion, eight hundred eleven million, eight hundred twenty-three thousand, two hundred forty-one".