810541 has 2 divisors, whose sum is σ = 810542. Its totient is φ = 810540.

The previous prime is 810539. The next prime is 810547. The reversal of 810541 is 145018.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 729316 + 81225 = 854^2 + 285^2 .

It is a cyclic number.

It is not a de Polignac number, because 810541 - 2¹ = 810539 is a prime.

Together with 810539, it forms a pair of twin primes.

It is an alternating number because its digits alternate between even and odd.

810541 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (810547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405270 + 405271.

It is an arithmetic number, because the mean of its divisors is an integer number (405271).

2⁸¹⁰⁵⁴¹ is an apocalyptic number.

It is an amenable number.

810541 is a deficient number, since it is larger than the sum of its proper divisors (1).

810541 is an equidigital number, since it uses as much as digits as its factorization.

810541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 810541 is about 900.3005053870. The cubic root of 810541 is about 93.2377238042.

Adding to 810541 its reverse (145018), we get a palindrome (955559).

The spelling of 810541 in words is "eight hundred ten thousand, five hundred forty-one".