791551 has 4 divisors (see below), whose sum is σ = 794632. Its totient is φ = 788472.

The previous prime is 791543. The next prime is 791561. The reversal of 791551 is 155197.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155197 = 7 ⋅22171.

It is a cyclic number.

It is not a de Polignac number, because 791551 - 2³ = 791543 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 (791561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1116 + ... + 1681.

It is an arithmetic number, because the mean of its divisors is an integer number (198658).

2⁷⁹¹⁵⁵¹ is an apocalyptic number.

791551 is a deficient number, since it is larger than the sum of its proper divisors (3081).

791551 is a wasteful number, since it uses less digits than its factorization.

791551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3080.

The product of its digits is 1575, while the sum is 28.

The square root of 791551 is about 889.6915195729. The cubic root of 791551 is about 92.5038128450.

The spelling of 791551 in words is "seven hundred ninety-one thousand, five hundred fifty-one".