721001041 has 4 divisors (see below), whose sum is σ = 721085092. Its totient is φ = 720916992.

The previous prime is 721001027. The next prime is 721001077. The reversal of 721001041 is 140100127.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 298287441 + 422713600 = 17271^2 + 20560^2 .

It is a cyclic number.

It is not a de Polignac number, because 721001041 - 2⁷ = 721000913 is a prime.

It is a super-3 number, since 3×721001041³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (721005041) 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, 27480 + ... + 46873.

It is an arithmetic number, because the mean of its divisors is an integer number (180271273).

Almost surely, 2^721001041 is an apocalyptic number.

It is an amenable number.

721001041 is a deficient number, since it is larger than the sum of its proper divisors (84051).

721001041 is an equidigital number, since it uses as much as digits as its factorization.

721001041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84050.

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

The square root of 721001041 is about 26851.4625486211. The cubic root of 721001041 is about 896.6961337973.

Adding to 721001041 its reverse (140100127), we get a palindrome (861101168).

The spelling of 721001041 in words is "seven hundred twenty-one million, one thousand, forty-one".