653204561 has 4 divisors (see below), whose sum is σ = 658348032. Its totient is φ = 648061092.

The previous prime is 653204551. The next prime is 653204569. The reversal of 653204561 is 165402356.

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 a de Polignac number, because none of the positive numbers 2^k-653204561 is a prime.

It is a super-2 number, since 2×653204561² = 853352397022405442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (653204569) 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, 2571545 + ... + 2571798.

It is an arithmetic number, because the mean of its divisors is an integer number (164587008).

Almost surely, 2^653204561 is an apocalyptic number.

It is an amenable number.

653204561 is a deficient number, since it is larger than the sum of its proper divisors (5143471).

653204561 is a wasteful number, since it uses less digits than its factorization.

653204561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5143470.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 653204561 is about 25557.8669102099. The cubic root of 653204561 is about 867.6603190153.

The spelling of 653204561 in words is "six hundred fifty-three million, two hundred four thousand, five hundred sixty-one".