1815361801 has 4 divisors (see below), whose sum is σ = 1980394704. Its totient is φ = 1650328900.

The previous prime is 1815361799. The next prime is 1815361811. The reversal of 1815361801 is 1081635181.

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 not a de Polignac number, because 1815361801 - 2¹ = 1815361799 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1815361811) 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, 82516435 + ... + 82516456.

It is an arithmetic number, because the mean of its divisors is an integer number (495098676).

Almost surely, 2^1815361801 is an apocalyptic number.

1815361801 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1815361801 is a deficient number, since it is larger than the sum of its proper divisors (165032903).

1815361801 is a wasteful number, since it uses less digits than its factorization.

1815361801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165032902.

The product of its (nonzero) digits is 5760, while the sum is 34.

The square root of 1815361801 is about 42607.0628065348. The cubic root of 1815361801 is about 1219.8911040042.

Adding to 1815361801 its reverse (1081635181), we get a palindrome (2896996982).

The spelling of 1815361801 in words is "one billion, eight hundred fifteen million, three hundred sixty-one thousand, eight hundred one".