3813281481121 has 4 divisors (see below), whose sum is σ = 4358035978432. Its totient is φ = 3268526983812.

The previous prime is 3813281481109. The next prime is 3813281481157. The reversal of 3813281481121 is 1211841823183.

It is a happy number.

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 3813281481121 - 2³⁵ = 3778921742753 is a prime.

It is a super-2 number, since 2×3813281481121² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3813281485121) 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, 272377248645 + ... + 272377248658.

It is an arithmetic number, because the mean of its divisors is an integer number (1089508994608).

Almost surely, 2^{3813281481121} is an apocalyptic number.

It is an amenable number.

3813281481121 is a deficient number, since it is larger than the sum of its proper divisors (544754497311).

3813281481121 is an equidigital number, since it uses as much as digits as its factorization.

3813281481121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544754497310.

The product of its digits is 73728, while the sum is 43.

The spelling of 3813281481121 in words is "three trillion, eight hundred thirteen billion, two hundred eighty-one million, four hundred eighty-one thousand, one hundred twenty-one".