3781541 has 4 divisors (see below), whose sum is σ = 3819084. Its totient is φ = 3744000.

The previous prime is 3781517. The next prime is 3781543. The reversal of 3781541 is 1451873.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1451873 = 131 ⋅11083.

It can be written as a sum of positive squares in 2 ways, for example, as 2989441 + 792100 = 1729^2 + 890^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3781541 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 (3781543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18620 + ... + 18821.

It is an arithmetic number, because the mean of its divisors is an integer number (954771).

Almost surely, 2^3781541 is an apocalyptic number.

It is an amenable number.

3781541 is a deficient number, since it is larger than the sum of its proper divisors (37543).

3781541 is a wasteful number, since it uses less digits than its factorization.

3781541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37542.

The product of its digits is 3360, while the sum is 29.

The square root of 3781541 is about 1944.6184715774. The cubic root of 3781541 is about 155.7959885220.

The spelling of 3781541 in words is "three million, seven hundred eighty-one thousand, five hundred forty-one".