1217042466391 has 4 divisors (see below), whose sum is σ = 1218222915984. Its totient is φ = 1215862016800.

The previous prime is 1217042466379. The next prime is 1217042466433. The reversal of 1217042466391 is 1936642407121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1217042466391 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 (1217042466691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 590223250 + ... + 590225311.

It is an arithmetic number, because the mean of its divisors is an integer number (304555728996).

Almost surely, 2^{1217042466391} is an apocalyptic number.

1217042466391 is a deficient number, since it is larger than the sum of its proper divisors (1180449593).

1217042466391 is a wasteful number, since it uses less digits than its factorization.

1217042466391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1180449592.

The product of its (nonzero) digits is 435456, while the sum is 46.

The spelling of 1217042466391 in words is "one trillion, two hundred seventeen billion, forty-two million, four hundred sixty-six thousand, three hundred ninety-one".