3811899921 has 4 divisors (see below), whose sum is σ = 5082533232. Its totient is φ = 2541266612.

The previous prime is 3811899899. The next prime is 3811899937. The reversal of 3811899921 is 1299981183.

3811899921 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 3811899921 - 2⁶ = 3811899857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3811899941) 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, 635316651 + ... + 635316656.

It is an arithmetic number, because the mean of its divisors is an integer number (1270633308).

Almost surely, 2^3811899921 is an apocalyptic number.

It is an amenable number.

3811899921 is a deficient number, since it is larger than the sum of its proper divisors (1270633311).

3811899921 is a wasteful number, since it uses less digits than its factorization.

3811899921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1270633310.

The product of its digits is 279936, while the sum is 51.

The square root of 3811899921 is about 61740.5856872123. The cubic root of 3811899921 is about 1562.1179758183.

The spelling of 3811899921 in words is "three billion, eight hundred eleven million, eight hundred ninety-nine thousand, nine hundred twenty-one".