129971057 has 2 divisors, whose sum is σ = 129971058. Its totient is φ = 129971056.

The previous prime is 129971033. The next prime is 129971071. The reversal of 129971057 is 750179921.

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., 129937201 + 33856 = 11399^2 + 184^2 .

It is a cyclic number.

It is not a de Polignac number, because 129971057 - 2⁶ = 129970993 is a prime.

It is not a weakly prime, because it can be changed into another prime (129971087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64985528 + 64985529.

It is an arithmetic number, because the mean of its divisors is an integer number (64985529).

Almost surely, 2^129971057 is an apocalyptic number.

It is an amenable number.

129971057 is a deficient number, since it is larger than the sum of its proper divisors (1).

129971057 is an equidigital number, since it uses as much as digits as its factorization.

129971057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39690, while the sum is 41.

The square root of 129971057 is about 11400.4849458258. The cubic root of 129971057 is about 506.5421044112.

The spelling of 129971057 in words is "one hundred twenty-nine million, nine hundred seventy-one thousand, fifty-seven".