791009855 has 4 divisors (see below), whose sum is σ = 949211832. Its totient is φ = 632807880.

The previous prime is 791009851. The next prime is 791009893. The reversal of 791009855 is 558900197.

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: 558900197 = 43 ⋅12997679.

It is not a de Polignac number, because 791009855 - 2² = 791009851 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 (791009851) 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, 79100981 + ... + 79100990.

It is an arithmetic number, because the mean of its divisors is an integer number (237302958).

Almost surely, 2^791009855 is an apocalyptic number.

791009855 is a deficient number, since it is larger than the sum of its proper divisors (158201977).

791009855 is a wasteful number, since it uses less digits than its factorization.

791009855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158201976.

The product of its (nonzero) digits is 113400, while the sum is 44.

The square root of 791009855 is about 28124.8974220352. The cubic root of 791009855 is about 924.8272791702.

The spelling of 791009855 in words is "seven hundred ninety-one million, nine thousand, eight hundred fifty-five".