1808182509121 has 4 divisors (see below), whose sum is σ = 1810977227712. Its totient is φ = 1805387790532.

The previous prime is 1808182509103. The next prime is 1808182509137. The reversal of 1808182509121 is 1219052818081.

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 not a de Polignac number, because 1808182509121 - 2¹¹ = 1808182507073 is a prime.

It is a super-2 number, since 2×1808182509121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1808182509191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1397358325 + ... + 1397359618.

It is an arithmetic number, because the mean of its divisors is an integer number (452744306928).

Almost surely, 2^{1808182509121} is an apocalyptic number.

It is an amenable number.

1808182509121 is a deficient number, since it is larger than the sum of its proper divisors (2794718591).

1808182509121 is an equidigital number, since it uses as much as digits as its factorization.

1808182509121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2794718590.

The product of its (nonzero) digits is 92160, while the sum is 46.

The spelling of 1808182509121 in words is "one trillion, eight hundred eight billion, one hundred eighty-two million, five hundred nine thousand, one hundred twenty-one".