3781216813 has 16 divisors (see below), whose sum is σ = 4420653696. Its totient is φ = 3199141440.

The previous prime is 3781216799. The next prime is 3781216853. The reversal of 3781216813 is 3186121873.

It is not a de Polignac number, because 3781216813 - 2²⁹ = 3244345901 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 (3781216853) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 192606 + ... + 211327.

It is an arithmetic number, because the mean of its divisors is an integer number (276290856).

Almost surely, 2^3781216813 is an apocalyptic number.

It is an amenable number.

3781216813 is a deficient number, since it is larger than the sum of its proper divisors (639436883).

3781216813 is a wasteful number, since it uses less digits than its factorization.

3781216813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404004.

The product of its digits is 48384, while the sum is 40.

The square root of 3781216813 is about 61491.5995319686. The cubic root of 3781216813 is about 1557.9153632664.

The spelling of 3781216813 in words is "three billion, seven hundred eighty-one million, two hundred sixteen thousand, eight hundred thirteen".