720201121 has 4 divisors (see below), whose sum is σ = 737767044. Its totient is φ = 702635200.

The previous prime is 720201113. The next prime is 720201127. The reversal of 720201121 is 121102027.

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 397603600 + 322597521 = 19940^2 + 17961^2 .

It is a cyclic number.

It is not a de Polignac number, because 720201121 - 2³ = 720201113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 720201095 and 720201104.

It is not an unprimeable number, because it can be changed into a prime (720201127) 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, 8782900 + ... + 8782981.

It is an arithmetic number, because the mean of its divisors is an integer number (184441761).

Almost surely, 2^720201121 is an apocalyptic number.

It is an amenable number.

720201121 is a deficient number, since it is larger than the sum of its proper divisors (17565923).

720201121 is a wasteful number, since it uses less digits than its factorization.

720201121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17565922.

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

The square root of 720201121 is about 26836.5631368847. The cubic root of 720201121 is about 896.3643956721.

Adding to 720201121 its reverse (121102027), we get a palindrome (841303148).

The spelling of 720201121 in words is "seven hundred twenty million, two hundred one thousand, one hundred twenty-one".