3603540721 has 8 divisors (see below), whose sum is σ = 3970058688. Its totient is φ = 3243510000.

The previous prime is 3603540679. The next prime is 3603540737. The reversal of 3603540721 is 1270453063.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3603540721 - 2¹⁵ = 3603507953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3603540751) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1620645 + ... + 1622866.

It is an arithmetic number, because the mean of its divisors is an integer number (496257336).

Almost surely, 2^3603540721 is an apocalyptic number.

It is an amenable number.

3603540721 is a deficient number, since it is larger than the sum of its proper divisors (366517967).

3603540721 is a wasteful number, since it uses less digits than its factorization.

3603540721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3243623.

The product of its (nonzero) digits is 15120, while the sum is 31.

The square root of 3603540721 is about 60029.4987568612. The cubic root of 3603540721 is about 1533.1211608702.

Adding to 3603540721 its reverse (1270453063), we get a palindrome (4873993784).

The spelling of 3603540721 in words is "three billion, six hundred three million, five hundred forty thousand, seven hundred twenty-one".