721041 has 4 divisors (see below), whose sum is σ = 961392. Its totient is φ = 480692.

The previous prime is 721037. The next prime is 721043. The reversal of 721041 is 140127.

721041 = T₂₇₄ + T₂₇₅ + ... + T₂₉₁.

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 721041 - 2² = 721037 is a prime.

It is a D-number.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 721041.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 721041.

It is not an unprimeable number, because it can be changed into a prime (721043) 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, 120171 + ... + 120176.

It is an arithmetic number, because the mean of its divisors is an integer number (240348).

2⁷²¹⁰⁴¹ is an apocalyptic number.

It is an amenable number.

721041 is a deficient number, since it is larger than the sum of its proper divisors (240351).

721041 is a wasteful number, since it uses less digits than its factorization.

721041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240350.

The product of its (nonzero) digits is 56, while the sum is 15.

The square root of 721041 is about 849.1413309927. The cubic root of 721041 is about 89.6712698923.

Adding to 721041 its reverse (140127), we get a palindrome (861168).

The spelling of 721041 in words is "seven hundred twenty-one thousand, forty-one", and thus it is an iban number.