3806831562821 has 4 divisors (see below), whose sum is σ = 4350664643232. Its totient is φ = 3262998482412.

The previous prime is 3806831562797. The next prime is 3806831562847. The reversal of 3806831562821 is 1282651386083.

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 a de Polignac number, because none of the positive numbers 2^k-3806831562821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3806831562421) 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, 271916540195 + ... + 271916540208.

It is an arithmetic number, because the mean of its divisors is an integer number (1087666160808).

Almost surely, 2^{3806831562821} is an apocalyptic number.

It is an amenable number.

3806831562821 is a deficient number, since it is larger than the sum of its proper divisors (543833080411).

3806831562821 is an equidigital number, since it uses as much as digits as its factorization.

3806831562821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543833080410.

The product of its (nonzero) digits is 3317760, while the sum is 53.

The spelling of 3806831562821 in words is "three trillion, eight hundred six billion, eight hundred thirty-one million, five hundred sixty-two thousand, eight hundred twenty-one".