4491436728601 has 3 divisors (see below), whose sum is σ = 4491438847903. Its totient is φ = 4491434609300.

The previous prime is 4491436728599. The next prime is 4491436728629. The reversal of 4491436728601 is 1068276341944.

It is a happy number.

The square root of 4491436728601 is 2119301.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 786504696201 + 3704932032400 = 886851^2 + 1924820^2 .

It is not a de Polignac number, because 4491436728601 - 2¹ = 4491436728599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4491436738601) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1059651 + ... + 3178951.

Almost surely, 2^{4491436728601} is an apocalyptic number.

4491436728601 is the 2119301-st square number.

4491436728601 is the 1059651-st centered octagonal number.

It is an amenable number.

4491436728601 is a deficient number, since it is larger than the sum of its proper divisors (2119302).

4491436728601 is an frugal number, since it uses more digits than its factorization.

4491436728601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4238602 (or 2119301 counting only the distinct ones).

The product of its (nonzero) digits is 6967296, while the sum is 55.

The spelling of 4491436728601 in words is "four trillion, four hundred ninety-one billion, four hundred thirty-six million, seven hundred twenty-eight thousand, six hundred one".