5601001721 has 4 divisors (see below), whose sum is σ = 6401144832. Its totient is φ = 4800858612.

The previous prime is 5601001709. The next prime is 5601001729. The reversal of 5601001721 is 1271001065.

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 not a de Polignac number, because 5601001721 - 2³⁰ = 4527259897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5601001729) 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, 400071545 + ... + 400071558.

It is an arithmetic number, because the mean of its divisors is an integer number (1600286208).

Almost surely, 2^5601001721 is an apocalyptic number.

It is an amenable number.

5601001721 is a deficient number, since it is larger than the sum of its proper divisors (800143111).

5601001721 is an equidigital number, since it uses as much as digits as its factorization.

5601001721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800143110.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 5601001721 is about 74839.8404661581. The cubic root of 5601001721 is about 1775.9138819443.

Adding to 5601001721 its reverse (1271001065), we get a palindrome (6872002786).

The spelling of 5601001721 in words is "five billion, six hundred one million, one thousand, seven hundred twenty-one".