39961109 has 2 divisors, whose sum is σ = 39961110. Its totient is φ = 39961108.

The previous prime is 39961069. The next prime is 39961111. The reversal of 39961109 is 90116993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39627025 + 334084 = 6295^2 + 578^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39961109 is a prime.

Together with 39961111, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39961309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19980554 + 19980555.

It is an arithmetic number, because the mean of its divisors is an integer number (19980555).

Almost surely, 2^39961109 is an apocalyptic number.

It is an amenable number.

39961109 is a deficient number, since it is larger than the sum of its proper divisors (1).

39961109 is an equidigital number, since it uses as much as digits as its factorization.

39961109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13122, while the sum is 38.

The square root of 39961109 is about 6321.4799691212. The cubic root of 39961109 is about 341.8843156034.

The spelling of 39961109 in words is "thirty-nine million, nine hundred sixty-one thousand, one hundred nine".