3781849561 has 8 divisors (see below), whose sum is σ = 4356147200. Its totient is φ = 3216060288.

The previous prime is 3781849559. The next prime is 3781849573. The reversal of 3781849561 is 1659481873.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3781849561 - 2¹ = 3781849559 is a prime.

It is a super-2 number, since 2×3781849561² = 28604772204071785442, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3781849499 and 3781849508.

It is not an unprimeable number, because it can be changed into a prime (3781840561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2126136 + ... + 2127913.

It is an arithmetic number, because the mean of its divisors is an integer number (544518400).

Almost surely, 2^3781849561 is an apocalyptic number.

It is an amenable number.

3781849561 is a deficient number, since it is larger than the sum of its proper divisors (574297639).

3781849561 is a wasteful number, since it uses less digits than its factorization.

3781849561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4254183.

The product of its digits is 1451520, while the sum is 52.

The square root of 3781849561 is about 61496.7443121992. The cubic root of 3781849561 is about 1558.0022588256.

The spelling of 3781849561 in words is "three billion, seven hundred eighty-one million, eight hundred forty-nine thousand, five hundred sixty-one".