797638591 has 4 divisors (see below), whose sum is σ = 825143400. Its totient is φ = 770133784.

The previous prime is 797638579. The next prime is 797638603. The reversal of 797638591 is 195836797.

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

It is an interprime number because it is at equal distance from previous prime (797638579) and next prime (797638603).

It is a cyclic number.

It is not a de Polignac number, because 797638591 - 2²³ = 789249983 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 (797638561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13752361 + ... + 13752418.

It is an arithmetic number, because the mean of its divisors is an integer number (206285850).

Almost surely, 2^797638591 is an apocalyptic number.

797638591 is a deficient number, since it is larger than the sum of its proper divisors (27504809).

797638591 is a wasteful number, since it uses less digits than its factorization.

797638591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27504808.

The product of its digits is 2857680, while the sum is 55.

The square root of 797638591 is about 28242.4961892535. The cubic root of 797638591 is about 927.4034757382.

The spelling of 797638591 in words is "seven hundred ninety-seven million, six hundred thirty-eight thousand, five hundred ninety-one".