811345 has 4 divisors (see below), whose sum is σ = 973620. Its totient is φ = 649072.

The previous prime is 811337. The next prime is 811351. The reversal of 811345 is 543118.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 169744 + 641601 = 412^2 + 801^2 .

It is a cyclic number.

It is not a de Polignac number, because 811345 - 2³ = 811337 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81130 + ... + 81139.

It is an arithmetic number, because the mean of its divisors is an integer number (243405).

2⁸¹¹³⁴⁵ is an apocalyptic number.

It is an amenable number.

811345 is a deficient number, since it is larger than the sum of its proper divisors (162275).

811345 is a wasteful number, since it uses less digits than its factorization.

811345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162274.

The product of its digits is 480, while the sum is 22.

The square root of 811345 is about 900.7469122900. The cubic root of 811345 is about 93.2685420509.

It can be divided in two parts, 8113 and 45, that multiplied together give a triangular number (365085 = T₈₅₄).

The spelling of 811345 in words is "eight hundred eleven thousand, three hundred forty-five".