3631513356409 has 3 divisors (see below), whose sum is σ = 3631515262063. Its totient is φ = 3631511450756.

The previous prime is 3631513356389. The next prime is 3631513356473. The reversal of 3631513356409 is 9046533151363.

The square root of 3631513356409 is 1905653.

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., 251166357225 + 3380346999184 = 501165^2 + 1838572^2 .

It is not a de Polignac number, because 3631513356409 - 2¹¹ = 3631513354361 is a prime.

It is a super-2 number, since 2×3631513356409² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3631513356209) 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, 952827 + ... + 2858479.

Almost surely, 2^{3631513356409} is an apocalyptic number.

3631513356409 is the 1905653-rd square number.

3631513356409 is the 952827-th centered octagonal number.

It is an amenable number.

3631513356409 is a deficient number, since it is larger than the sum of its proper divisors (1905654).

3631513356409 is an frugal number, since it uses more digits than its factorization.

3631513356409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3811306 (or 1905653 counting only the distinct ones).

The product of its (nonzero) digits is 2624400, while the sum is 49.

Multiplying 3631513356409 by its sum of digits (49), we get a square (177944154464041 = 13339571²).

The spelling of 3631513356409 in words is "three trillion, six hundred thirty-one billion, five hundred thirteen million, three hundred fifty-six thousand, four hundred nine".