9945109 has 2 divisors, whose sum is σ = 9945110. Its totient is φ = 9945108.

The previous prime is 9945101. The next prime is 9945121. The reversal of 9945109 is 9015499.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5522500 + 4422609 = 2350^2 + 2103^2 .

It is a cyclic number.

It is not a de Polignac number, because 9945109 - 2³ = 9945101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9945101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4972554 + 4972555.

It is an arithmetic number, because the mean of its divisors is an integer number (4972555).

Almost surely, 2^9945109 is an apocalyptic number.

It is an amenable number.

9945109 is a deficient number, since it is larger than the sum of its proper divisors (1).

9945109 is an equidigital number, since it uses as much as digits as its factorization.

9945109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14580, while the sum is 37.

The square root of 9945109 is about 3153.5866882012. The cubic root of 9945109 is about 215.0485486183.

The spelling of 9945109 in words is "nine million, nine hundred forty-five thousand, one hundred nine".