1291223883897 has 8 divisors (see below), whose sum is σ = 1912924272480. Its totient is φ = 860815922580.

The previous prime is 1291223883841. The next prime is 1291223883959. The reversal of 1291223883897 is 7983883221921.

1291223883897 is a `hidden beast` number, since 1 + 2 + 9 + 12 + 238 + 8 + 389 + 7 = 666.

It is not a de Polignac number, because 1291223883897 - 2⁷ = 1291223883769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1291223888897) 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 7 ways as a sum of consecutive naturals, for example, 23911553379 + ... + 23911553432.

It is an arithmetic number, because the mean of its divisors is an integer number (239115534060).

Almost surely, 2^{1291223883897} is an apocalyptic number.

It is an amenable number.

1291223883897 is a deficient number, since it is larger than the sum of its proper divisors (621700388583).

1291223883897 is an equidigital number, since it uses as much as digits as its factorization.

1291223883897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47823106820 (or 47823106814 counting only the distinct ones).

The product of its digits is 20901888, while the sum is 63.

The spelling of 1291223883897 in words is "one trillion, two hundred ninety-one billion, two hundred twenty-three million, eight hundred eighty-three thousand, eight hundred ninety-seven".