9811945 has 16 divisors (see below), whose sum is σ = 13833792. Its totient is φ = 6586560.

The previous prime is 9811939. The next prime is 9811969. The reversal of 9811945 is 5491189.

It is not a de Polignac number, because 9811945 - 2⁷ = 9811817 is a prime.

It is a Duffinian number.

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, 6147 + ... + 7576.

It is an arithmetic number, because the mean of its divisors is an integer number (864612).

Almost surely, 2^9811945 is an apocalyptic number.

It is an amenable number.

9811945 is a deficient number, since it is larger than the sum of its proper divisors (4021847).

9811945 is a wasteful number, since it uses less digits than its factorization.

9811945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13752.

The product of its digits is 12960, while the sum is 37.

The square root of 9811945 is about 3132.4024326386. The cubic root of 9811945 is about 214.0844063929.

It can be divided in two parts, 981 and 1945, that added together give a triangular number (2926 = T₇₆).

The spelling of 9811945 in words is "nine million, eight hundred eleven thousand, nine hundred forty-five".