129071381 has 2 divisors, whose sum is σ = 129071382. Its totient is φ = 129071380.

The previous prime is 129071363. The next prime is 129071417. The reversal of 129071381 is 183170921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97812100 + 31259281 = 9890^2 + 5591^2 .

It is an emirp because it is prime and its reverse (183170921) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129071381 is a prime.

It is a super-2 number, since 2×129071381² = 33318842786494322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p_7328507 and since 129071381 and 7328507 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129073381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64535690 + 64535691.

It is an arithmetic number, because the mean of its divisors is an integer number (64535691).

Almost surely, 2^129071381 is an apocalyptic number.

It is an amenable number.

129071381 is a deficient number, since it is larger than the sum of its proper divisors (1).

129071381 is an equidigital number, since it uses as much as digits as its factorization.

129071381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 129071381 is about 11360.9586303269. The cubic root of 129071381 is about 505.3706144576.

The spelling of 129071381 in words is "one hundred twenty-nine million, seventy-one thousand, three hundred eighty-one".