4065621331 has 4 divisors (see below), whose sum is σ = 4205815200. Its totient is φ = 3925427464.

The previous prime is 4065621323. The next prime is 4065621353. The reversal of 4065621331 is 1331265604.

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 4065621331 - 2³ = 4065621323 is a prime.

It is a super-2 number, since 2×4065621331² = 33058553614164423122, 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 = 4065621293 and 4065621302.

It is not an unprimeable number, because it can be changed into a prime (4065621031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70096891 + ... + 70096948.

It is an arithmetic number, because the mean of its divisors is an integer number (1051453800).

Almost surely, 2^4065621331 is an apocalyptic number.

4065621331 is a deficient number, since it is larger than the sum of its proper divisors (140193869).

4065621331 is a wasteful number, since it uses less digits than its factorization.

4065621331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140193868.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 4065621331 is about 63762.2249533374. The cubic root of 4065621331 is about 1596.0346246333.

Adding to 4065621331 its reverse (1331265604), we get a palindrome (5396886935).

The spelling of 4065621331 in words is "four billion, sixty-five million, six hundred twenty-one thousand, three hundred thirty-one".