791557 has 4 divisors (see below), whose sum is σ = 852460. Its totient is φ = 730656.

The previous prime is 791543. The next prime is 791561. The reversal of 791557 is 755197.

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: 755197 = 53 ⋅14249.

It can be written as a sum of positive squares in 2 ways, for example, as 70756 + 720801 = 266^2 + 849^2 .

It is a cyclic number.

It is not a de Polignac number, because 791557 - 2¹⁵ = 758789 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 (791257) 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, 30432 + ... + 30457.

It is an arithmetic number, because the mean of its divisors is an integer number (213115).

2⁷⁹¹⁵⁵⁷ is an apocalyptic number.

It is an amenable number.

791557 is a deficient number, since it is larger than the sum of its proper divisors (60903).

791557 is a wasteful number, since it uses less digits than its factorization.

791557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60902.

The product of its digits is 11025, while the sum is 34.

The square root of 791557 is about 889.6948915218. The cubic root of 791557 is about 92.5040465724.

The spelling of 791557 in words is "seven hundred ninety-one thousand, five hundred fifty-seven".