7781041 has 4 divisors (see below), whose sum is σ = 7789684. Its totient is φ = 7772400.

The previous prime is 7781029. The next prime is 7781057. The reversal of 7781041 is 1401877.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1401877 = 19 ⋅73783.

It can be written as a sum of positive squares in 2 ways, for example, as 5832225 + 1948816 = 2415^2 + 1396^2 .

It is a cyclic number.

It is not a de Polignac number, because 7781041 - 2¹⁷ = 7649969 is a prime.

It is a Duffinian number.

7781041 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7781441) 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, 2790 + ... + 4831.

It is an arithmetic number, because the mean of its divisors is an integer number (1947421).

Almost surely, 2^7781041 is an apocalyptic number.

It is an amenable number.

7781041 is a deficient number, since it is larger than the sum of its proper divisors (8643).

7781041 is a wasteful number, since it uses less digits than its factorization.

7781041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8642.

The product of its (nonzero) digits is 1568, while the sum is 28.

The square root of 7781041 is about 2789.4517382453. The cubic root of 7781041 is about 198.1584369391.

It can be divided in two parts, 77 and 81041, that added together give a palindrome (81118).

The spelling of 7781041 in words is "seven million, seven hundred eighty-one thousand, forty-one".