816261 has 16 divisors (see below), whose sum is σ = 1148928. Its totient is φ = 514800.

The previous prime is 816251. The next prime is 816271. The reversal of 816261 is 162618.

It is an interprime number because it is at equal distance from previous prime (816251) and next prime (816271).

It is not a de Polignac number, because 816261 - 2⁷ = 816133 is a prime.

It is a Curzon number.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6166 + ... + 6296.

It is an arithmetic number, because the mean of its divisors is an integer number (71808).

2⁸¹⁶²⁶¹ is an apocalyptic number.

It is an amenable number.

816261 is a deficient number, since it is larger than the sum of its proper divisors (332667).

816261 is a wasteful number, since it uses less digits than its factorization.

816261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232.

The product of its digits is 576, while the sum is 24.

The square root of 816261 is about 903.4716376290. The cubic root of 816261 is about 93.4565365590.

Adding to 816261 its reverse (162618), we get a palindrome (978879).

The spelling of 816261 in words is "eight hundred sixteen thousand, two hundred sixty-one".