721732201 has 4 divisors (see below), whose sum is σ = 724884100. Its totient is φ = 718580304.

The previous prime is 721732189. The next prime is 721732213. The reversal of 721732201 is 102237127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 102237127 = 97 ⋅1053991.

It is an interprime number because it is at equal distance from previous prime (721732189) and next prime (721732213).

It can be written as a sum of positive squares in 2 ways, for example, as 690428176 + 31304025 = 26276^2 + 5595^2 .

It is a cyclic number.

It is not a de Polignac number, because 721732201 - 2¹¹ = 721730153 is a prime.

It is a super-3 number, since 3×721732201³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (721732261) 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, 1575606 + ... + 1576063.

It is an arithmetic number, because the mean of its divisors is an integer number (181221025).

Almost surely, 2^721732201 is an apocalyptic number.

It is an amenable number.

721732201 is a deficient number, since it is larger than the sum of its proper divisors (3151899).

721732201 is a wasteful number, since it uses less digits than its factorization.

721732201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3151898.

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 721732201 is about 26865.0739995259. The cubic root of 721732201 is about 896.9991416112. Note that the first 3 decimals are identical.

Adding to 721732201 its reverse (102237127), we get a palindrome (823969328).

The spelling of 721732201 in words is "seven hundred twenty-one million, seven hundred thirty-two thousand, two hundred one".