1612321 has 4 divisors (see below), whose sum is σ = 1697200. Its totient is φ = 1527444.

The previous prime is 1612319. The next prime is 1612327. The reversal of 1612321 is 1232161.

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: 1232161 = 7 ⋅176023.

It is a cyclic number.

It is not a de Polignac number, because 1612321 - 2¹ = 1612319 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1612295 and 1612304.

It is not an unprimeable number, because it can be changed into a prime (1612327) 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, 42411 + ... + 42448.

It is an arithmetic number, because the mean of its divisors is an integer number (424300).

2^1612321 is an apocalyptic number.

It is an amenable number.

1612321 is a deficient number, since it is larger than the sum of its proper divisors (84879).

1612321 is an equidigital number, since it uses as much as digits as its factorization.

1612321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84878.

The product of its digits is 72, while the sum is 16.

The square root of 1612321 is about 1269.7720267828. The cubic root of 1612321 is about 117.2601656936.

Adding to 1612321 its reverse (1232161), we get a palindrome (2844482).

It can be divided in two parts, 16 and 12321, that multiplied together give a square (197136 = 444²).

The spelling of 1612321 in words is "one million, six hundred twelve thousand, three hundred twenty-one".