321625 has 16 divisors (see below), whose sum is σ = 419328. Its totient is φ = 246000.

The previous prime is 321619. The next prime is 321631. The reversal of 321625 is 526123.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (321619) and next prime (321631).

It is not a de Polignac number, because 321625 - 2³ = 321617 is a prime.

It is a Duffinian number.

321625 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3834 + ... + 3916.

It is an arithmetic number, because the mean of its divisors is an integer number (26208).

2³²¹⁶²⁵ is an apocalyptic number.

It is an amenable number.

321625 is a deficient number, since it is larger than the sum of its proper divisors (97703).

321625 is an equidigital number, since it uses as much as digits as its factorization.

321625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129 (or 119 counting only the distinct ones).

The product of its digits is 360, while the sum is 19.

The square root of 321625 is about 567.1199167725. The cubic root of 321625 is about 68.5146220584.

Adding to 321625 its reverse (526123), we get a palindrome (847748).

It can be divided in two parts, 321 and 625, that added together give a triangular number (946 = T₄₃).

The spelling of 321625 in words is "three hundred twenty-one thousand, six hundred twenty-five".