3813115891 has 4 divisors (see below), whose sum is σ = 4106432512. Its totient is φ = 3519799272.

The previous prime is 3813115883. The next prime is 3813115913. The reversal of 3813115891 is 1985113183.

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

It is a cyclic number.

It is not a de Polignac number, because 3813115891 - 2³ = 3813115883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3813115841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146658291 + ... + 146658316.

It is an arithmetic number, because the mean of its divisors is an integer number (1026608128).

Almost surely, 2^3813115891 is an apocalyptic number.

3813115891 is a deficient number, since it is larger than the sum of its proper divisors (293316621).

3813115891 is a wasteful number, since it uses less digits than its factorization.

3813115891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293316620.

The product of its digits is 25920, while the sum is 40.

The square root of 3813115891 is about 61750.4323142761. The cubic root of 3813115891 is about 1562.2840598093.

The spelling of 3813115891 in words is "three billion, eight hundred thirteen million, one hundred fifteen thousand, eight hundred ninety-one".