1321625 has 16 divisors (see below), whose sum is σ = 1681680. Its totient is φ = 1036800.

The previous prime is 1321601. The next prime is 1321627. The reversal of 1321625 is 5261231.

It can be written as a sum of positive squares in 8 ways, for example, as 337561 + 984064 = 581^2 + 992^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1321625 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1321597 and 1321606.

It is not an unprimeable number, because it can be changed into a prime (1321627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12071 + ... + 12179.

It is an arithmetic number, because the mean of its divisors is an integer number (105105).

2^1321625 is an apocalyptic number.

It is an amenable number.

1321625 is a deficient number, since it is larger than the sum of its proper divisors (360055).

1321625 is an equidigital number, since it uses as much as digits as its factorization.

1321625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221 (or 211 counting only the distinct ones).

The product of its digits is 360, while the sum is 20.

The square root of 1321625 is about 1149.6195022702. The cubic root of 1321625 is about 109.7411267847.

Adding to 1321625 its reverse (5261231), we get a palindrome (6582856).

The spelling of 1321625 in words is "one million, three hundred twenty-one thousand, six hundred twenty-five".