8041781 has 12 divisors (see below), whose sum is σ = 9060492. Its totient is φ = 7128000.

The previous prime is 8041771. The next prime is 8041783. The reversal of 8041781 is 1871408.

It can be written as a sum of positive squares in 2 ways, for example, as 2907025 + 5134756 = 1705^2 + 2266^2 .

It is not a de Polignac number, because 8041781 - 2⁶ = 8041717 is a prime.

It is a super-2 number, since 2×8041781² = 129340483303922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8041783) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4151 + ... + 5771.

It is an arithmetic number, because the mean of its divisors is an integer number (755041).

Almost surely, 2^8041781 is an apocalyptic number.

It is an amenable number.

8041781 is a deficient number, since it is larger than the sum of its proper divisors (1018711).

8041781 is a wasteful number, since it uses less digits than its factorization.

8041781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1684 (or 1673 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 29.

The square root of 8041781 is about 2835.8034134968. The cubic root of 8041781 is about 200.3475706234.

The spelling of 8041781 in words is "eight million, forty-one thousand, seven hundred eighty-one".