2604531653 has 4 divisors (see below), whose sum is σ = 2604653580. Its totient is φ = 2604409728.

The previous prime is 2604531623. The next prime is 2604531659. The reversal of 2604531653 is 3561354062.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 915486049 + 1689045604 = 30257^2 + 41098^2 .

It is a cyclic number.

It is not a de Polignac number, because 2604531653 - 2²² = 2600337349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2604531659) 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, 19538 + ... + 74771.

It is an arithmetic number, because the mean of its divisors is an integer number (651163395).

Almost surely, 2^2604531653 is an apocalyptic number.

It is an amenable number.

2604531653 is a deficient number, since it is larger than the sum of its proper divisors (121927).

2604531653 is an equidigital number, since it uses as much as digits as its factorization.

2604531653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121926.

The product of its (nonzero) digits is 64800, while the sum is 35.

The square root of 2604531653 is about 51034.6123038081. The cubic root of 2604531653 is about 1375.8672924805.

The spelling of 2604531653 in words is "two billion, six hundred four million, five hundred thirty-one thousand, six hundred fifty-three".