775321 has 4 divisors (see below), whose sum is σ = 783412. Its totient is φ = 767232.

The previous prime is 775309. The next prime is 775343. The reversal of 775321 is 123577.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 123577 = 191 ⋅647.

It can be written as a sum of positive squares in 2 ways, for example, as 190096 + 585225 = 436^2 + 765^2 .

It is a cyclic number.

It is not a de Polignac number, because 775321 - 2⁷ = 775193 is a prime.

It is a super-2 number, since 2×775321² = 1202245306082, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (775361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3900 + ... + 4093.

It is an arithmetic number, because the mean of its divisors is an integer number (195853).

2⁷⁷⁵³²¹ is an apocalyptic number.

It is an amenable number.

775321 is a deficient number, since it is larger than the sum of its proper divisors (8091).

775321 is an equidigital number, since it uses as much as digits as its factorization.

775321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8090.

The product of its digits is 1470, while the sum is 25.

The square root of 775321 is about 880.5231399572. The cubic root of 775321 is about 91.8672076011.

Adding to 775321 its reverse (123577), we get a palindrome (898898).

The spelling of 775321 in words is "seven hundred seventy-five thousand, three hundred twenty-one".