721141 has 2 divisors, whose sum is σ = 721142. Its totient is φ = 721140.

The previous prime is 721139. The next prime is 721159. The reversal of 721141 is 141127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 461041 + 260100 = 679^2 + 510^2 .

It is a cyclic number.

It is not a de Polignac number, because 721141 - 2¹ = 721139 is a prime.

Together with 721139, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360570 + 360571.

It is an arithmetic number, because the mean of its divisors is an integer number (360571).

2⁷²¹¹⁴¹ is an apocalyptic number.

It is an amenable number.

721141 is a deficient number, since it is larger than the sum of its proper divisors (1).

721141 is an equidigital number, since it uses as much as digits as its factorization.

721141 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56, while the sum is 16.

The square root of 721141 is about 849.2002119642. The cubic root of 721141 is about 89.6754151547.

Adding to 721141 its reverse (141127), we get a palindrome (862268).

The spelling of 721141 in words is "seven hundred twenty-one thousand, one hundred forty-one", and thus it is an iban number.