1653523 has 4 divisors (see below), whose sum is σ = 1676248. Its totient is φ = 1630800.

The previous prime is 1653521. The next prime is 1653541. The reversal of 1653523 is 3253561.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1653523 - 2¹ = 1653521 is a prime.

It is a d-powerful number, because it can be written as 1 + 6² + 5² + 3¹⁰ + 5² + 2⁶ + 3¹³ .

It is a Duffinian number.

1653523 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1653521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11253 + ... + 11398.

It is an arithmetic number, because the mean of its divisors is an integer number (419062).

2^1653523 is an apocalyptic number.

1653523 is a deficient number, since it is larger than the sum of its proper divisors (22725).

1653523 is an equidigital number, since it uses as much as digits as its factorization.

1653523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22724.

The product of its digits is 2700, while the sum is 25.

The square root of 1653523 is about 1285.8938525399. The cubic root of 1653523 is about 118.2506164420.

The spelling of 1653523 in words is "one million, six hundred fifty-three thousand, five hundred twenty-three".