604621561 has 4 divisors (see below), whose sum is σ = 604692324. Its totient is φ = 604550800.

The previous prime is 604621559. The next prime is 604621573. The reversal of 604621561 is 165126406.

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

It can be written as a sum of positive squares in 2 ways, for example, as 102010000 + 502611561 = 10100^2 + 22419^2 .

It is a cyclic number.

It is not a de Polignac number, because 604621561 - 2¹ = 604621559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (604621531) 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, 20470 + ... + 40351.

It is an arithmetic number, because the mean of its divisors is an integer number (151173081).

Almost surely, 2^604621561 is an apocalyptic number.

It is an amenable number.

604621561 is a deficient number, since it is larger than the sum of its proper divisors (70763).

604621561 is an equidigital number, since it uses as much as digits as its factorization.

604621561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70762.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 604621561 is about 24589.0536824824. The cubic root of 604621561 is about 845.5926708220.

Adding to 604621561 its reverse (165126406), we get a palindrome (769747967).

The spelling of 604621561 in words is "six hundred four million, six hundred twenty-one thousand, five hundred sixty-one".