3656521331 has 4 divisors (see below), whose sum is σ = 3774473664. Its totient is φ = 3538569000.

The previous prime is 3656521277. The next prime is 3656521333. The reversal of 3656521331 is 1331256563.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3656521331 - 2¹⁴ = 3656504947 is a prime.

It is a super-2 number, since 2×3656521331² = 26740296488116023122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3656521291 and 3656521300.

It is not an unprimeable number, because it can be changed into a prime (3656521333) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58976120 + ... + 58976181.

It is an arithmetic number, because the mean of its divisors is an integer number (943618416).

Almost surely, 2^3656521331 is an apocalyptic number.

3656521331 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

3656521331 is a deficient number, since it is larger than the sum of its proper divisors (117952333).

3656521331 is a wasteful number, since it uses less digits than its factorization.

3656521331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117952332.

The product of its digits is 48600, while the sum is 35.

The square root of 3656521331 is about 60469.1767018536. The cubic root of 3656521331 is about 1540.5981444113.

Adding to 3656521331 its reverse (1331256563), we get a palindrome (4987777894).

The spelling of 3656521331 in words is "three billion, six hundred fifty-six million, five hundred twenty-one thousand, three hundred thirty-one".