755221 has 4 divisors (see below), whose sum is σ = 756972. Its totient is φ = 753472.

The previous prime is 755213. The next prime is 755233. The reversal of 755221 is 122557.

755221 = 614² + 615².

755221 is nontrivially palindromic in base 5.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 376996 + 378225 = 614^2 + 615^2 .

It is a cyclic number.

It is not a de Polignac number, because 755221 - 2³ = 755213 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10 and base 15.

It is a junction number, because it is equal to n+sod(n) for n = 755192 and 755201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (785221) 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, 285 + ... + 1261.

It is an arithmetic number, because the mean of its divisors is an integer number (189243).

2⁷⁵⁵²²¹ is an apocalyptic number.

755221 is the 615-th centered square number.

It is an amenable number.

755221 is a deficient number, since it is larger than the sum of its proper divisors (1751).

755221 is an equidigital number, since it uses as much as digits as its factorization.

755221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1750.

The product of its digits is 700, while the sum is 22.

The square root of 755221 is about 869.0345217539. The cubic root of 755221 is about 91.0663686832.

Adding to 755221 its reverse (122557), we get a palindrome (877778).

The spelling of 755221 in words is "seven hundred fifty-five thousand, two hundred twenty-one".