845981109 has 12 divisors (see below), whose sum is σ = 1223136096. Its totient is φ = 563450472.

The previous prime is 845981107. The next prime is 845981141. The reversal of 845981109 is 901189548.

It is not a de Polignac number, because 845981109 - 2¹ = 845981107 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (845981107) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34647 + ... + 53780.

It is an arithmetic number, because the mean of its divisors is an integer number (101928008).

Almost surely, 2^845981109 is an apocalyptic number.

It is an amenable number.

845981109 is a deficient number, since it is larger than the sum of its proper divisors (377154987).

845981109 is a wasteful number, since it uses less digits than its factorization.

845981109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89496 (or 89493 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 45.

The square root of 845981109 is about 29085.7543997057. The cubic root of 845981109 is about 945.7729495310.

The spelling of 845981109 in words is "eight hundred forty-five million, nine hundred eighty-one thousand, one hundred nine".