4091781 has 8 divisors (see below), whose sum is σ = 5776704. Its totient is φ = 2567360.

The previous prime is 4091777. The next prime is 4091797. The reversal of 4091781 is 1871904.

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

It is a cyclic number.

It is not a de Polignac number, because 4091781 - 2² = 4091777 is a prime.

It is a super-2 number, since 2×4091781² = 33485343503922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4091741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40065 + ... + 40166.

It is an arithmetic number, because the mean of its divisors is an integer number (722088).

Almost surely, 2^4091781 is an apocalyptic number.

It is an amenable number.

4091781 is a deficient number, since it is larger than the sum of its proper divisors (1684923).

4091781 is a wasteful number, since it uses less digits than its factorization.

4091781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80251.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 4091781 is about 2022.8151176022. The cubic root of 4091781 is about 159.9450462318.

The spelling of 4091781 in words is "four million, ninety-one thousand, seven hundred eighty-one".