917240642191 has 4 divisors (see below), whose sum is σ = 919311163272. Its totient is φ = 915170121112.

The previous prime is 917240642173. The next prime is 917240642231. The reversal of 917240642191 is 191246042719.

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

It is a cyclic number.

It is not a de Polignac number, because 917240642191 - 2⁹ = 917240641679 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 (917240642291) 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, 1035259876 + ... + 1035260761.

It is an arithmetic number, because the mean of its divisors is an integer number (229827790818).

Almost surely, 2^917240642191 is an apocalyptic number.

917240642191 is a deficient number, since it is larger than the sum of its proper divisors (2070521081).

917240642191 is a wasteful number, since it uses less digits than its factorization.

917240642191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2070521080.

The product of its (nonzero) digits is 217728, while the sum is 46.

The spelling of 917240642191 in words is "nine hundred seventeen billion, two hundred forty million, six hundred forty-two thousand, one hundred ninety-one".