39009181 has 2 divisors, whose sum is σ = 39009182. Its totient is φ = 39009180.

The previous prime is 39009161. The next prime is 39009221. The reversal of 39009181 is 18190093.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38875225 + 133956 = 6235^2 + 366^2 .

It is an emirp because it is prime and its reverse (18190093) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39009181 - 2²³ = 30620573 is a prime.

It is a super-2 number, since 2×39009181² = 3043432404581522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39009121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19504590 + 19504591.

It is an arithmetic number, because the mean of its divisors is an integer number (19504591).

Almost surely, 2^39009181 is an apocalyptic number.

It is an amenable number.

39009181 is a deficient number, since it is larger than the sum of its proper divisors (1).

39009181 is an equidigital number, since it uses as much as digits as its factorization.

39009181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 39009181 is about 6245.7330234329. The cubic root of 39009181 is about 339.1477530787.

The spelling of 39009181 in words is "thirty-nine million, nine thousand, one hundred eighty-one".