721311201 has 12 divisors (see below), whose sum is σ = 1122039828. Its totient is φ = 443883744.

The previous prime is 721311191. The next prime is 721311233. The reversal of 721311201 is 102113127.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 189778176 + 531533025 = 13776^2 + 23055^2 .

It is not a de Polignac number, because 721311201 - 2⁶ = 721311137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (721311271) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3082410 + ... + 3082643.

It is an arithmetic number, because the mean of its divisors is an integer number (93503319).

Almost surely, 2^721311201 is an apocalyptic number.

It is an amenable number.

721311201 is a deficient number, since it is larger than the sum of its proper divisors (400728627).

721311201 is a wasteful number, since it uses less digits than its factorization.

721311201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6165072 (or 6165069 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 18.

The square root of 721311201 is about 26857.2374044688. The cubic root of 721311201 is about 896.8246955173.

Adding to 721311201 its reverse (102113127), we get a palindrome (823424328).

The spelling of 721311201 in words is "seven hundred twenty-one million, three hundred eleven thousand, two hundred one".