1621325 has 6 divisors (see below), whose sum is σ = 2010474. Its totient is φ = 1297040.

The previous prime is 1621309. The next prime is 1621349. The reversal of 1621325 is 5231261.

It can be written as a sum of positive squares in 3 ways, for example, as 243049 + 1378276 = 493^2 + 1174^2 .

It is not a de Polignac number, because 1621325 - 2⁴ = 1621309 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1621297 and 1621306.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 32402 + ... + 32451.

It is an arithmetic number, because the mean of its divisors is an integer number (335079).

2^1621325 is an apocalyptic number.

It is an amenable number.

1621325 is a deficient number, since it is larger than the sum of its proper divisors (389149).

1621325 is an equidigital number, since it uses as much as digits as its factorization.

1621325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64863 (or 64858 counting only the distinct ones).

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

The square root of 1621325 is about 1273.3126089064. The cubic root of 1621325 is about 117.4780402601.

Adding to 1621325 its reverse (5231261), we get a palindrome (6852586).

The spelling of 1621325 in words is "one million, six hundred twenty-one thousand, three hundred twenty-five".