3531720545 has 4 divisors (see below), whose sum is σ = 4238064660. Its totient is φ = 2825376432.

The previous prime is 3531720529. The next prime is 3531720583. The reversal of 3531720545 is 5450271353.

3531720545 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5450271353 = 19 ⋅286856387.

It can be written as a sum of positive squares in 2 ways, for example, as 776625424 + 2755095121 = 27868^2 + 52489^2 .

It is a cyclic number.

It is not a de Polignac number, because 3531720545 - 2⁴ = 3531720529 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 353172050 + ... + 353172059.

It is an arithmetic number, because the mean of its divisors is an integer number (1059516165).

Almost surely, 2^3531720545 is an apocalyptic number.

It is an amenable number.

3531720545 is a deficient number, since it is larger than the sum of its proper divisors (706344115).

3531720545 is an equidigital number, since it uses as much as digits as its factorization.

3531720545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 706344114.

The product of its (nonzero) digits is 63000, while the sum is 35.

The square root of 3531720545 is about 59428.2806835264. The cubic root of 3531720545 is about 1522.8674727721.

Adding to 3531720545 its reverse (5450271353), we get a palindrome (8981991898).

The spelling of 3531720545 in words is "three billion, five hundred thirty-one million, seven hundred twenty thousand, five hundred forty-five".