3604921681 has 3 divisors (see below), whose sum is σ = 3604981723. Its totient is φ = 3604861640.

The previous prime is 3604921669. The next prime is 3604921687. The reversal of 3604921681 is 1861294063.

The square root of 3604921681 is 60041.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1861294063 = 59 ⋅31547357.

It can be written as a sum of positive squares in only one way, i.e., 3601080081 + 3841600 = 60009^2 + 1960^2 .

It is not a de Polignac number, because 3604921681 - 2¹⁹ = 3604397393 is a prime.

It is a super-2 number, since 2×3604921681² = 25990920652287731522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3604921687) 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, 30021 + ... + 90061.

Almost surely, 2^3604921681 is an apocalyptic number.

3604921681 is the 60041-st square number.

3604921681 is the 30021-st centered octagonal number.

It is an amenable number.

3604921681 is a deficient number, since it is larger than the sum of its proper divisors (60042).

3604921681 is an frugal number, since it uses more digits than its factorization.

3604921681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120082 (or 60041 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

The cubic root of 3604921681 is about 1533.3169783332.

The spelling of 3604921681 in words is "three billion, six hundred four million, nine hundred twenty-one thousand, six hundred eighty-one".