605721561 has 8 divisors (see below), whose sum is σ = 829456704. Its totient is φ = 392900400.

The previous prime is 605721541. The next prime is 605721563. The reversal of 605721561 is 165127506.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 605721561 - 2⁶ = 605721497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (605721563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2728365 + ... + 2728586.

It is an arithmetic number, because the mean of its divisors is an integer number (103682088).

Almost surely, 2^605721561 is an apocalyptic number.

It is an amenable number.

605721561 is a deficient number, since it is larger than the sum of its proper divisors (223735143).

605721561 is a wasteful number, since it uses less digits than its factorization.

605721561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5456991.

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 605721561 is about 24611.4111948096. The cubic root of 605721561 is about 846.1051613263.

The spelling of 605721561 in words is "six hundred five million, seven hundred twenty-one thousand, five hundred sixty-one".