1813165201 has 4 divisors (see below), whose sum is σ = 1851743232. Its totient is φ = 1774587172.

The previous prime is 1813165199. The next prime is 1813165273. The reversal of 1813165201 is 1025613181.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1025613181 = 1109 ⋅924809.

It is a cyclic number.

It is not a de Polignac number, because 1813165201 - 2¹ = 1813165199 is a prime.

It is a super-2 number, since 2×1813165201² = 6575136092234740802, which contains 22 as substring.

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 1813165201.

It is not an unprimeable number, because it can be changed into a prime (1813165001) 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, 19288945 + ... + 19289038.

It is an arithmetic number, because the mean of its divisors is an integer number (462935808).

Almost surely, 2^1813165201 is an apocalyptic number.

It is an amenable number.

1813165201 is a deficient number, since it is larger than the sum of its proper divisors (38578031).

1813165201 is an equidigital number, since it uses as much as digits as its factorization.

1813165201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38578030.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 1813165201 is about 42581.2775876910. The cubic root of 1813165201 is about 1219.3988799367.

Adding to 1813165201 its reverse (1025613181), we get a palindrome (2838778382).

The spelling of 1813165201 in words is "one billion, eight hundred thirteen million, one hundred sixty-five thousand, two hundred one".