129571993 has 2 divisors, whose sum is σ = 129571994. Its totient is φ = 129571992.

The previous prime is 129571987. The next prime is 129572021. The reversal of 129571993 is 399175921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72539289 + 57032704 = 8517^2 + 7552^2 .

It is a cyclic number.

It is not a de Polignac number, because 129571993 - 2¹⁷ = 129440921 is a prime.

It is not a weakly prime, because it can be changed into another prime (129571933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64785996 + 64785997.

It is an arithmetic number, because the mean of its divisors is an integer number (64785997).

Almost surely, 2^129571993 is an apocalyptic number.

It is an amenable number.

129571993 is a deficient number, since it is larger than the sum of its proper divisors (1).

129571993 is an equidigital number, since it uses as much as digits as its factorization.

129571993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 153090, while the sum is 46.

The square root of 129571993 is about 11382.9694280535. The cubic root of 129571993 is about 506.0231428223.

The spelling of 129571993 in words is "one hundred twenty-nine million, five hundred seventy-one thousand, nine hundred ninety-three".