815812201 has 16 divisors (see below), whose sum is σ = 877008384. Its totient is φ = 756173824.

The previous prime is 815812163. The next prime is 815812247. The reversal of 815812201 is 102218518.

It is a cyclic number.

It is not a de Polignac number, because 815812201 - 2⁷ = 815812073 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 815812201.

It is not an unprimeable number, because it can be changed into a prime (815812801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 319536 + ... + 322078.

It is an arithmetic number, because the mean of its divisors is an integer number (54813024).

Almost surely, 2^815812201 is an apocalyptic number.

It is an amenable number.

815812201 is a deficient number, since it is larger than the sum of its proper divisors (61196183).

815812201 is a wasteful number, since it uses less digits than its factorization.

815812201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2840.

The product of its (nonzero) digits is 1280, while the sum is 28.

The square root of 815812201 is about 28562.4263850255. The cubic root of 815812201 is about 934.3940523715.

The spelling of 815812201 in words is "eight hundred fifteen million, eight hundred twelve thousand, two hundred one".