3811381215849 has 6 divisors (see below), whose sum is σ = 5505328422906. Its totient is φ = 2540920810560.

The previous prime is 3811381215787. The next prime is 3811381215853. The reversal of 3811381215849 is 9485121831183.

3811381215849 is a `hidden beast` number, since 3 + 8 + 1 + 1 + 38 + 1 + 21 + 584 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 3281006936025 + 530374279824 = 1811355^2 + 728268^2 .

It is not a de Polignac number, because 3811381215849 - 2⁹ = 3811381215337 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3811381215795 and 3811381215804.

It is not an unprimeable number, because it can be changed into a prime (3811381215749) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 211743400872 + ... + 211743400889.

It is an arithmetic number, because the mean of its divisors is an integer number (917554737151).

Almost surely, 2^{3811381215849} is an apocalyptic number.

It is an amenable number.

3811381215849 is a deficient number, since it is larger than the sum of its proper divisors (1693947207057).

3811381215849 is a wasteful number, since it uses less digits than its factorization.

3811381215849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423486801767 (or 423486801764 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 54.

The spelling of 3811381215849 in words is "three trillion, eight hundred eleven billion, three hundred eighty-one million, two hundred fifteen thousand, eight hundred forty-nine".