816001 has 4 divisors (see below), whose sum is σ = 819504. Its totient is φ = 812500.

The previous prime is 815989. The next prime is 816019. The reversal of 816001 is 100618.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 816001 - 2¹³ = 807809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (816091) 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, 1375 + ... + 1876.

It is an arithmetic number, because the mean of its divisors is an integer number (204876).

2⁸¹⁶⁰⁰¹ is an apocalyptic number.

It is an amenable number.

816001 is a deficient number, since it is larger than the sum of its proper divisors (3503).

816001 is a wasteful number, since it uses less digits than its factorization.

816001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3502.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 816001 is about 903.3277367600. The cubic root of 816001 is about 93.4466127397.

Adding to 816001 its reverse (100618), we get a palindrome (916619).

The spelling of 816001 in words is "eight hundred sixteen thousand, one".