1291021456317 has 16 divisors (see below), whose sum is σ = 1749620482368. Its totient is φ = 846614920320.

The previous prime is 1291021456247. The next prime is 1291021456327. The reversal of 1291021456317 is 7136541201921.

It is not a de Polignac number, because 1291021456317 - 2¹⁹ = 1291020932029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291021456327) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7820559 + ... + 7983932.

It is an arithmetic number, because the mean of its divisors is an integer number (109351280148).

Almost surely, 2^{1291021456317} is an apocalyptic number.

It is an amenable number.

1291021456317 is a deficient number, since it is larger than the sum of its proper divisors (458599026051).

1291021456317 is a wasteful number, since it uses less digits than its factorization.

1291021456317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15804940.

The product of its (nonzero) digits is 90720, while the sum is 42.

The spelling of 1291021456317 in words is "one trillion, two hundred ninety-one billion, twenty-one million, four hundred fifty-six thousand, three hundred seventeen".