771321 has 4 divisors (see below), whose sum is σ = 1028432. Its totient is φ = 514212.

The previous prime is 771301. The next prime is 771349. The reversal of 771321 is 123177.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 771321 - 2⁵ = 771289 is a prime.

It is a D-number.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 771321.

It is not an unprimeable number, because it can be changed into a prime (771301) 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, 128551 + ... + 128556.

It is an arithmetic number, because the mean of its divisors is an integer number (257108).

2⁷⁷¹³²¹ is an apocalyptic number.

It is an amenable number.

771321 is a deficient number, since it is larger than the sum of its proper divisors (257111).

771321 is a wasteful number, since it uses less digits than its factorization.

771321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257110.

The product of its digits is 294, while the sum is 21.

The square root of 771321 is about 878.2488257891. The cubic root of 771321 is about 91.7089494557.

Adding to 771321 its reverse (123177), we get a palindrome (894498).

The spelling of 771321 in words is "seven hundred seventy-one thousand, three hundred twenty-one", and thus it is an iban number.