3651221433 has 4 divisors (see below), whose sum is σ = 4868295248. Its totient is φ = 2434147620.

The previous prime is 3651221419. The next prime is 3651221467. The reversal of 3651221433 is 3341221563.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3341221563 = 3 ⋅1113740521.

It is not a de Polignac number, because 3651221433 - 2⁵ = 3651221401 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3651221433.

It is not an unprimeable number, because it can be changed into a prime (3651226433) 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, 608536903 + ... + 608536908.

It is an arithmetic number, because the mean of its divisors is an integer number (1217073812).

Almost surely, 2^3651221433 is an apocalyptic number.

It is an amenable number.

3651221433 is a deficient number, since it is larger than the sum of its proper divisors (1217073815).

3651221433 is a wasteful number, since it uses less digits than its factorization.

3651221433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1217073814.

The product of its digits is 12960, while the sum is 30.

The square root of 3651221433 is about 60425.3376738600. The cubic root of 3651221433 is about 1539.8534510852.

Adding to 3651221433 its reverse (3341221563), we get a palindrome (6992442996).

The spelling of 3651221433 in words is "three billion, six hundred fifty-one million, two hundred twenty-one thousand, four hundred thirty-three".