1623121 has 4 divisors (see below), whose sum is σ = 1660912. Its totient is φ = 1585332.

The previous prime is 1623107. The next prime is 1623137. The reversal of 1623121 is 1213261.

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.

It is a cyclic number.

It is not a de Polignac number, because 1623121 - 2⁹ = 1622609 is a prime.

It is a Duffinian number.

1623121 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1623095 and 1623104.

It is not an unprimeable number, because it can be changed into a prime (1623161) 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, 18831 + ... + 18916.

It is an arithmetic number, because the mean of its divisors is an integer number (415228).

2^1623121 is an apocalyptic number.

It is an amenable number.

1623121 is a deficient number, since it is larger than the sum of its proper divisors (37791).

1623121 is an equidigital number, since it uses as much as digits as its factorization.

1623121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37790.

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

The square root of 1623121 is about 1274.0176607881. The cubic root of 1623121 is about 117.5214024692.

Adding to 1623121 its reverse (1213261), we get a palindrome (2836382).

The spelling of 1623121 in words is "one million, six hundred twenty-three thousand, one hundred twenty-one".