39181381 has 2 divisors, whose sum is σ = 39181382. Its totient is φ = 39181380.

The previous prime is 39181357. The next prime is 39181403. The reversal of 39181381 is 18318193.

It is a happy number.

39181381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36409156 + 2772225 = 6034^2 + 1665^2 .

It is a cyclic number.

It is not a de Polignac number, because 39181381 - 2⁷ = 39181253 is a prime.

It is a super-2 number, since 2×39181381² = 3070361234134322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39181081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19590690 + 19590691.

It is an arithmetic number, because the mean of its divisors is an integer number (19590691).

Almost surely, 2^39181381 is an apocalyptic number.

It is an amenable number.

39181381 is a deficient number, since it is larger than the sum of its proper divisors (1).

39181381 is an equidigital number, since it uses as much as digits as its factorization.

39181381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 34.

The square root of 39181381 is about 6259.5032550515. The cubic root of 39181381 is about 339.6460590099.

The spelling of 39181381 in words is "thirty-nine million, one hundred eighty-one thousand, three hundred eighty-one".