7071721 has 8 divisors (see below), whose sum is σ = 7293384. Its totient is φ = 6852480.

The previous prime is 7071719. The next prime is 7071739. The reversal of 7071721 is 1271707.

It can be written as a sum of positive squares in 4 ways, for example, as 1946025 + 5125696 = 1395^2 + 2264^2 .

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 7071721 - 2¹ = 7071719 is a prime.

It is a super-3 number, since 3×7071721³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7071121) 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, 6595 + ... + 7591.

It is an arithmetic number, because the mean of its divisors is an integer number (911673).

Almost surely, 2^7071721 is an apocalyptic number.

It is an amenable number.

7071721 is a deficient number, since it is larger than the sum of its proper divisors (221663).

7071721 is a wasteful number, since it uses less digits than its factorization.

7071721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1211.

The product of its (nonzero) digits is 686, while the sum is 25.

The square root of 7071721 is about 2659.2707647022. The cubic root of 7071721 is about 191.9442202693.

The spelling of 7071721 in words is "seven million, seventy-one thousand, seven hundred twenty-one".