1781852945 has 16 divisors (see below), whose sum is σ = 2213514000. Its totient is φ = 1375358208.

The previous prime is 1781852939. The next prime is 1781852953. The reversal of 1781852945 is 5492581871.

It is a Cunningham number, because it is equal to 42212²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 24482704 + 1757370241 = 4948^2 + 41921^2 .

It is a cyclic number.

It is not a de Polignac number, because 1781852945 - 2²⁰ = 1780804369 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1781852893 and 1781852902.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 255971 + ... + 262839.

It is an arithmetic number, because the mean of its divisors is an integer number (138344625).

Almost surely, 2^1781852945 is an apocalyptic number.

It is an amenable number.

1781852945 is a deficient number, since it is larger than the sum of its proper divisors (431661055).

1781852945 is a wasteful number, since it uses less digits than its factorization.

1781852945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8692.

The product of its digits is 806400, while the sum is 50.

The square root of 1781852945 is about 42212.0000118450. Note that the first 4 decimals coincide. The cubic root of 1781852945 is about 1212.3386559678.

The spelling of 1781852945 in words is "one billion, seven hundred eighty-one million, eight hundred fifty-two thousand, nine hundred forty-five".