3813881555 has 16 divisors (see below), whose sum is σ = 4995496800. Its totient is φ = 2772188160.

The previous prime is 3813881527. The next prime is 3813881563. The reversal of 3813881555 is 5551883183.

It is a de Polignac number, because none of the positive numbers 2^k-3813881555 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85541 + ... + 122249.

It is an arithmetic number, because the mean of its divisors is an integer number (312218550).

Almost surely, 2^3813881555 is an apocalyptic number.

3813881555 is a deficient number, since it is larger than the sum of its proper divisors (1181615245).

3813881555 is a wasteful number, since it uses less digits than its factorization.

3813881555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38614.

The product of its digits is 576000, while the sum is 47.

The square root of 3813881555 is about 61756.6316681860. The cubic root of 3813881555 is about 1562.3886203701.

The spelling of 3813881555 in words is "three billion, eight hundred thirteen million, eight hundred eighty-one thousand, five hundred fifty-five".