816901 has 8 divisors (see below), whose sum is σ = 895320. Its totient is φ = 741888.

The previous prime is 816899. The next prime is 816911. The reversal of 816901 is 109618.

816901 = T₁₃₈ + T₁₃₉ + ... + T₁₉₅.

816901 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 160801 + 656100 = 401^2 + 810^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 816901 - 2¹ = 816899 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816911) 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, 336 + ... + 1321.

It is an arithmetic number, because the mean of its divisors is an integer number (111915).

2⁸¹⁶⁹⁰¹ is an apocalyptic number.

It is an amenable number.

816901 is a deficient number, since it is larger than the sum of its proper divisors (78419).

816901 is a wasteful number, since it uses less digits than its factorization.

816901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1703.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 816901 is about 903.8257575440. The cubic root of 816901 is about 93.4809554471.

The spelling of 816901 in words is "eight hundred sixteen thousand, nine hundred one".