810215201 has 4 divisors (see below), whose sum is σ = 818081472. Its totient is φ = 802348932.

The previous prime is 810215191. The next prime is 810215221. The reversal of 810215201 is 102512018.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-810215201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (810215221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3932981 + ... + 3933186.

It is an arithmetic number, because the mean of its divisors is an integer number (204520368).

Almost surely, 2^810215201 is an apocalyptic number.

It is an amenable number.

810215201 is a deficient number, since it is larger than the sum of its proper divisors (7866271).

810215201 is a wasteful number, since it uses less digits than its factorization.

810215201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7866270.

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 810215201 is about 28464.2793866277. The cubic root of 810215201 is about 932.2522975063.

Adding to 810215201 its reverse (102512018), we get a palindrome (912727219).

The spelling of 810215201 in words is "eight hundred ten million, two hundred fifteen thousand, two hundred one".