129684157 has 2 divisors, whose sum is σ = 129684158. Its totient is φ = 129684156.

The previous prime is 129684151. The next prime is 129684161. The reversal of 129684157 is 751486921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75012921 + 54671236 = 8661^2 + 7394^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129684157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129684151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64842078 + 64842079.

It is an arithmetic number, because the mean of its divisors is an integer number (64842079).

Almost surely, 2^129684157 is an apocalyptic number.

It is an amenable number.

129684157 is a deficient number, since it is larger than the sum of its proper divisors (1).

129684157 is an equidigital number, since it uses as much as digits as its factorization.

129684157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 43.

The square root of 129684157 is about 11387.8951962160. The cubic root of 129684157 is about 506.1691136939.

The spelling of 129684157 in words is "one hundred twenty-nine million, six hundred eighty-four thousand, one hundred fifty-seven".