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BaseRepresentation
bin10101110100111001111001
3101202200201121
4111310321321
52431043341
6322345241
766430255
oct25647171
911680647
105721721
1132588a5
121abb221
131254445
14a8d265
157804d1
hex574e79

5721721 has 8 divisors (see below), whose sum is σ = 5900040. Its totient is φ = 5546112.

The previous prime is 5721719. The next prime is 5721743. The reversal of 5721721 is 1271275.

It is a happy number.

5721721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 14400 + 5707321 = 120^2 + 2389^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 5721721 - 21 = 5721719 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5725721) 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, 4111 + ... + 5323.

It is an arithmetic number, because the mean of its divisors is an integer number (737505).

Almost surely, 25721721 is an apocalyptic number.

It is an amenable number.

5721721 is a deficient number, since it is larger than the sum of its proper divisors (178319).

5721721 is a wasteful number, since it uses less digits than its factorization.

5721721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1355.

The product of its digits is 980, while the sum is 25.

The square root of 5721721 is about 2392.0119146860. The cubic root of 5721721 is about 178.8582150740.

Adding to 5721721 its reverse (1271275), we get a palindrome (6992996).

The spelling of 5721721 in words is "five million, seven hundred twenty-one thousand, seven hundred twenty-one".

Divisors: 1 53 89 1213 4717 64289 107957 5721721