129243157 has 2 divisors, whose sum is σ = 129243158. Its totient is φ = 129243156.

The previous prime is 129243089. The next prime is 129243167. The reversal of 129243157 is 751342921.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123454321 + 5788836 = 11111^2 + 2406^2 .

It is a cyclic number.

It is not a de Polignac number, because 129243157 - 2¹¹ = 129241109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129243167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64621578 + 64621579.

It is an arithmetic number, because the mean of its divisors is an integer number (64621579).

Almost surely, 2^129243157 is an apocalyptic number.

It is an amenable number.

129243157 is a deficient number, since it is larger than the sum of its proper divisors (1).

129243157 is an equidigital number, since it uses as much as digits as its factorization.

129243157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 34.

The square root of 129243157 is about 11368.5160421226. The cubic root of 129243157 is about 505.5947076675.

The spelling of 129243157 in words is "one hundred twenty-nine million, two hundred forty-three thousand, one hundred fifty-seven".