325721 has 4 divisors (see below), whose sum is σ = 355344. Its totient is φ = 296100.

The previous prime is 325709. The next prime is 325723. The reversal of 325721 is 127523.

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, and also an emirpimes, since its reverse is a distinct semiprime: 127523 = 11 ⋅11593.

It is a cyclic number.

It is not a de Polignac number, because 325721 - 2¹⁰ = 324697 is a prime.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 325693 and 325702.

It is not an unprimeable number, because it can be changed into a prime (325723) 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, 14795 + ... + 14816.

It is an arithmetic number, because the mean of its divisors is an integer number (88836).

2³²⁵⁷²¹ is an apocalyptic number.

It is an amenable number.

325721 is a deficient number, since it is larger than the sum of its proper divisors (29623).

325721 is a wasteful number, since it uses less digits than its factorization.

325721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29622.

The product of its digits is 420, while the sum is 20.

The square root of 325721 is about 570.7197210540. The cubic root of 325721 is about 68.8042480927.

The spelling of 325721 in words is "three hundred twenty-five thousand, seven hundred twenty-one".