811802 has 4 divisors (see below), whose sum is σ = 1217706. Its totient is φ = 405900.

The previous prime is 811799. The next prime is 811819. The reversal of 811802 is 208118.

It is a Cunningham number, because it is equal to 901²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 208118 = 2 ⋅104059.

It can be written as a sum of positive squares in only one way, i.e., 811801 + 1 = 901^2 + 1^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202949 + ... + 202952.

2⁸¹¹⁸⁰² is an apocalyptic number.

811802 is a deficient number, since it is larger than the sum of its proper divisors (405904).

811802 is a wasteful number, since it uses less digits than its factorization.

811802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405903.

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 811802 is about 901.0005549388. Note that the first 3 decimals coincide. The cubic root of 811802 is about 93.2860503133.

The spelling of 811802 in words is "eight hundred eleven thousand, eight hundred two".