1798516145 has 4 divisors (see below), whose sum is σ = 2158219380. Its totient is φ = 1438812912.

The previous prime is 1798516099. The next prime is 1798516157. The reversal of 1798516145 is 5416158971.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5416158971 = 6269 ⋅863959.

It can be written as a sum of positive squares in 2 ways, for example, as 376321201 + 1422194944 = 19399^2 + 37712^2 .

It is a cyclic number.

It is not a de Polignac number, because 1798516145 - 2⁶ = 1798516081 is a prime.

It is a super-2 number, since 2×1798516145² = 6469320647651322050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1798516145.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 179851610 + ... + 179851619.

It is an arithmetic number, because the mean of its divisors is an integer number (539554845).

Almost surely, 2^1798516145 is an apocalyptic number.

It is an amenable number.

1798516145 is a deficient number, since it is larger than the sum of its proper divisors (359703235).

1798516145 is an equidigital number, since it uses as much as digits as its factorization.

1798516145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359703234.

The product of its digits is 302400, while the sum is 47.

The square root of 1798516145 is about 42408.9158668316. The cubic root of 1798516145 is about 1216.1060440418.

The spelling of 1798516145 in words is "one billion, seven hundred ninety-eight million, five hundred sixteen thousand, one hundred forty-five".