3501631521 has 12 divisors (see below), whose sum is σ = 5061828772. Its totient is φ = 2332613376.

The previous prime is 3501631517. The next prime is 3501631537. The reversal of 3501631521 is 1251361053.

3501631521 is a `hidden beast` number, since 3 + 5 + 0 + 1 + 631 + 5 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2424479121 + 1077152400 = 49239^2 + 32820^2 .

It is not a de Polignac number, because 3501631521 - 2² = 3501631517 is a prime.

It is a super-2 number, since 2×3501631521² = 24522846617721546882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3501631541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 138316 + ... + 161661.

Almost surely, 2^3501631521 is an apocalyptic number.

It is an amenable number.

3501631521 is a deficient number, since it is larger than the sum of its proper divisors (1560197251).

3501631521 is a wasteful number, since it uses less digits than its factorization.

3501631521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301280 (or 301277 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 3501631521 is about 59174.5850936025. The cubic root of 3501631521 is about 1518.5303663696.

Adding to 3501631521 its reverse (1251361053), we get a palindrome (4752992574).

The spelling of 3501631521 in words is "three billion, five hundred one million, six hundred thirty-one thousand, five hundred twenty-one".