865541 has 8 divisors (see below), whose sum is σ = 900600. Its totient is φ = 831168.

The previous prime is 865537. The next prime is 865577. The reversal of 865541 is 145568.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 73441 + 792100 = 271^2 + 890^2 .

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

It is not a de Polignac number, because 865541 - 2² = 865537 is a prime.

It is a super-2 number, since 2×865541² = 1498322445362, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865511) 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, 5435 + ... + 5591.

It is an arithmetic number, because the mean of its divisors is an integer number (112575).

2⁸⁶⁵⁵⁴¹ is an apocalyptic number.

It is an amenable number.

865541 is a deficient number, since it is larger than the sum of its proper divisors (35059).

865541 is a wasteful number, since it uses less digits than its factorization.

865541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343.

The product of its digits is 4800, while the sum is 29.

The square root of 865541 is about 930.3445598272. The cubic root of 865541 is about 95.3006541401.

The spelling of 865541 in words is "eight hundred sixty-five thousand, five hundred forty-one".