791664947 has 4 divisors (see below), whose sum is σ = 794057016. Its totient is φ = 789272880.

The previous prime is 791664931. The next prime is 791664977. The reversal of 791664947 is 749466197.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 749466197 = 1249 ⋅600053.

It is a cyclic number.

It is not a de Polignac number, because 791664947 - 2⁴ = 791664931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (791664977) 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 3 ways as a sum of consecutive naturals, for example, 1195538 + ... + 1196199.

It is an arithmetic number, because the mean of its divisors is an integer number (198514254).

Almost surely, 2^791664947 is an apocalyptic number.

791664947 is a deficient number, since it is larger than the sum of its proper divisors (2392069).

791664947 is a wasteful number, since it uses less digits than its factorization.

791664947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2392068.

The product of its digits is 2286144, while the sum is 53.

The square root of 791664947 is about 28136.5411342617. The cubic root of 791664947 is about 925.0825139930.

The spelling of 791664947 in words is "seven hundred ninety-one million, six hundred sixty-four thousand, nine hundred forty-seven".