129031061 has 2 divisors, whose sum is σ = 129031062. Its totient is φ = 129031060.

The previous prime is 129031057. The next prime is 129031073. The reversal of 129031061 is 160130921.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81558961 + 47472100 = 9031^2 + 6890^2 .

It is an emirp because it is prime and its reverse (160130921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129031061 - 2² = 129031057 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129061061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64515530 + 64515531.

It is an arithmetic number, because the mean of its divisors is an integer number (64515531).

Almost surely, 2^129031061 is an apocalyptic number.

It is an amenable number.

129031061 is a deficient number, since it is larger than the sum of its proper divisors (1).

129031061 is an equidigital number, since it uses as much as digits as its factorization.

129031061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 129031061 is about 11359.1839935798. The cubic root of 129031061 is about 505.3179855294.

Adding to 129031061 its reverse (160130921), we get a palindrome (289161982).

The spelling of 129031061 in words is "one hundred twenty-nine million, thirty-one thousand, sixty-one".