129971399 has 2 divisors, whose sum is σ = 129971400. Its totient is φ = 129971398.

The previous prime is 129971389. The next prime is 129971407. The reversal of 129971399 is 993179921.

It is a strong prime.

It is an emirp because it is prime and its reverse (993179921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129971399 - 2⁴ = 129971383 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129971389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64985699 + 64985700.

It is an arithmetic number, because the mean of its divisors is an integer number (64985700).

Almost surely, 2^129971399 is an apocalyptic number.

129971399 is a deficient number, since it is larger than the sum of its proper divisors (1).

129971399 is an equidigital number, since it uses as much as digits as its factorization.

129971399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 275562, while the sum is 50.

The square root of 129971399 is about 11400.4999451778. The cubic root of 129971399 is about 506.5425487082.

The spelling of 129971399 in words is "one hundred twenty-nine million, nine hundred seventy-one thousand, three hundred ninety-nine".