1653121 has 4 divisors (see below), whose sum is σ = 1681200. Its totient is φ = 1625044.

The previous prime is 1653109. The next prime is 1653149. The reversal of 1653121 is 1213561.

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 1653121 - 2⁷ = 1652993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1653101) 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, 13951 + ... + 14068.

It is an arithmetic number, because the mean of its divisors is an integer number (420300).

2^1653121 is an apocalyptic number.

It is an amenable number.

1653121 is a deficient number, since it is larger than the sum of its proper divisors (28079).

1653121 is an equidigital number, since it uses as much as digits as its factorization.

1653121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28078.

The product of its digits is 180, while the sum is 19.

The square root of 1653121 is about 1285.7375315359. The cubic root of 1653121 is about 118.2410327429.

Adding to 1653121 its reverse (1213561), we get a palindrome (2866682).

The spelling of 1653121 in words is "one million, six hundred fifty-three thousand, one hundred twenty-one".