6781541 has 4 divisors (see below), whose sum is σ = 7303212. Its totient is φ = 6259872.

The previous prime is 6781531. The next prime is 6781543. The reversal of 6781541 is 1451876.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 556516 + 6225025 = 746^2 + 2495^2 .

It is a cyclic number.

It is not a de Polignac number, because 6781541 - 2¹⁰ = 6780517 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6781498 and 6781507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6781543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 260816 + ... + 260841.

It is an arithmetic number, because the mean of its divisors is an integer number (1825803).

Almost surely, 2^6781541 is an apocalyptic number.

It is an amenable number.

6781541 is a deficient number, since it is larger than the sum of its proper divisors (521671).

6781541 is a wasteful number, since it uses less digits than its factorization.

6781541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521670.

The product of its digits is 6720, while the sum is 32.

The square root of 6781541 is about 2604.1392051885. The cubic root of 6781541 is about 189.2820643959.

The spelling of 6781541 in words is "six million, seven hundred eighty-one thousand, five hundred forty-one".