3813288721 has 4 divisors (see below), whose sum is σ = 4159951344. Its totient is φ = 3466626100.

The previous prime is 3813288707. The next prime is 3813288781. The reversal of 3813288721 is 1278823183.

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.

It is a cyclic number.

It is not a de Polignac number, because 3813288721 - 2⁷ = 3813288593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3813288701) 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, 173331295 + ... + 173331316.

It is an arithmetic number, because the mean of its divisors is an integer number (1039987836).

Almost surely, 2^3813288721 is an apocalyptic number.

It is an amenable number.

3813288721 is a deficient number, since it is larger than the sum of its proper divisors (346662623).

3813288721 is a wasteful number, since it uses less digits than its factorization.

3813288721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346662622.

The product of its digits is 129024, while the sum is 43.

The square root of 3813288721 is about 61751.8317218202. The cubic root of 3813288721 is about 1562.3076630323.

The spelling of 3813288721 in words is "three billion, eight hundred thirteen million, two hundred eighty-eight thousand, seven hundred twenty-one".