1816735145 has 4 divisors (see below), whose sum is σ = 2180082180. Its totient is φ = 1453388112.

The previous prime is 1816735121. The next prime is 1816735153. The reversal of 1816735145 is 5415376181.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 236513641 + 1580221504 = 15379^2 + 39752^2 .

It is a cyclic number.

It is not a de Polignac number, because 1816735145 - 2⁸ = 1816734889 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 181673510 + ... + 181673519.

It is an arithmetic number, because the mean of its divisors is an integer number (545020545).

Almost surely, 2^1816735145 is an apocalyptic number.

It is an amenable number.

1816735145 is a deficient number, since it is larger than the sum of its proper divisors (363347035).

1816735145 is an equidigital number, since it uses as much as digits as its factorization.

1816735145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363347034.

The product of its digits is 100800, while the sum is 41.

The square root of 1816735145 is about 42623.1761486635. The cubic root of 1816735145 is about 1220.1986474437.

The spelling of 1816735145 in words is "one billion, eight hundred sixteen million, seven hundred thirty-five thousand, one hundred forty-five".