129512077 has 2 divisors, whose sum is σ = 129512078. Its totient is φ = 129512076.

The previous prime is 129512039. The next prime is 129512093. The reversal of 129512077 is 770215921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73770921 + 55741156 = 8589^2 + 7466^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129512077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129512027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64756038 + 64756039.

It is an arithmetic number, because the mean of its divisors is an integer number (64756039).

Almost surely, 2^129512077 is an apocalyptic number.

It is an amenable number.

129512077 is a deficient number, since it is larger than the sum of its proper divisors (1).

129512077 is an equidigital number, since it uses as much as digits as its factorization.

129512077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8820, while the sum is 34.

The square root of 129512077 is about 11380.3372972861. The cubic root of 129512077 is about 505.9451332761.

Adding to 129512077 its reverse (770215921), we get a palindrome (899727998).

The spelling of 129512077 in words is "one hundred twenty-nine million, five hundred twelve thousand, seventy-seven".