6001564721 has 4 divisors (see below), whose sum is σ = 6002678052. Its totient is φ = 6000451392.

The previous prime is 6001564711. The next prime is 6001564729. The reversal of 6001564721 is 1274651006.

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 1790982400 + 4210582321 = 42320^2 + 64889^2 .

It is a cyclic number.

It is not a de Polignac number, because 6001564721 - 2³⁰ = 4927822897 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6001564729) 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, 548540 + ... + 559373.

It is an arithmetic number, because the mean of its divisors is an integer number (1500669513).

Almost surely, 2^6001564721 is an apocalyptic number.

It is an amenable number.

6001564721 is a deficient number, since it is larger than the sum of its proper divisors (1113331).

6001564721 is a wasteful number, since it uses less digits than its factorization.

6001564721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1113330.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 6001564721 is about 77469.7664963565. The cubic root of 6001564721 is about 1817.2785394779.

The spelling of 6001564721 in words is "six billion, one million, five hundred sixty-four thousand, seven hundred twenty-one".