3814781721 has 4 divisors (see below), whose sum is σ = 5086375632. Its totient is φ = 2543187812.

The previous prime is 3814781717. The next prime is 3814781723. The reversal of 3814781721 is 1271874183.

3814781721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 3814781721 - 2² = 3814781717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3814781723) 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, 635796951 + ... + 635796956.

It is an arithmetic number, because the mean of its divisors is an integer number (1271593908).

Almost surely, 2^3814781721 is an apocalyptic number.

It is an amenable number.

3814781721 is a deficient number, since it is larger than the sum of its proper divisors (1271593911).

3814781721 is a wasteful number, since it uses less digits than its factorization.

3814781721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1271593910.

The product of its digits is 75264, while the sum is 42.

The square root of 3814781721 is about 61763.9192490243. The cubic root of 3814781721 is about 1562.5115308888.

The spelling of 3814781721 in words is "three billion, eight hundred fourteen million, seven hundred eighty-one thousand, seven hundred twenty-one".