3811021 has 4 divisors (see below), whose sum is σ = 3817852. Its totient is φ = 3804192.

The previous prime is 3811013. The next prime is 3811057. The reversal of 3811021 is 1201183.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1022121 + 2788900 = 1011^2 + 1670^2 .

It is a cyclic number.

It is not a de Polignac number, because 3811021 - 2³ = 3811013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3810986 and 3811004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3811081) 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, 2496 + ... + 3721.

It is an arithmetic number, because the mean of its divisors is an integer number (954463).

Almost surely, 2^3811021 is an apocalyptic number.

It is an amenable number.

3811021 is a deficient number, since it is larger than the sum of its proper divisors (6831).

3811021 is an equidigital number, since it uses as much as digits as its factorization.

3811021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6830.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 3811021 is about 1952.1836491478. The cubic root of 3811021 is about 156.1997905874.

The spelling of 3811021 in words is "three million, eight hundred eleven thousand, twenty-one".