1812554545 has 4 divisors (see below), whose sum is σ = 2175065460. Its totient is φ = 1450043632.

The previous prime is 1812554543. The next prime is 1812554561. The reversal of 1812554545 is 5454552181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5454552181 = 13 ⋅419580937.

It can be written as a sum of positive squares in 2 ways, for example, as 198443569 + 1614110976 = 14087^2 + 40176^2 .

It is a cyclic number.

It is not a de Polignac number, because 1812554545 - 2¹ = 1812554543 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 1812554498 and 1812554507.

It is not an unprimeable number, because it can be changed into a prime (1812554543) 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, 181255450 + ... + 181255459.

It is an arithmetic number, because the mean of its divisors is an integer number (543766365).

Almost surely, 2^1812554545 is an apocalyptic number.

It is an amenable number.

1812554545 is a deficient number, since it is larger than the sum of its proper divisors (362510915).

1812554545 is an equidigital number, since it uses as much as digits as its factorization.

1812554545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362510914.

The product of its digits is 160000, while the sum is 40.

The square root of 1812554545 is about 42574.1065085340. The cubic root of 1812554545 is about 1219.2619707621.

The spelling of 1812554545 in words is "one billion, eight hundred twelve million, five hundred fifty-four thousand, five hundred forty-five".