129393977 has 2 divisors, whose sum is σ = 129393978. Its totient is φ = 129393976.

The previous prime is 129393967. The next prime is 129393983. The reversal of 129393977 is 779393921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 126585001 + 2808976 = 11251^2 + 1676^2 .

It is a cyclic number.

It is not a de Polignac number, because 129393977 - 2¹⁰ = 129392953 is a prime.

It is not a weakly prime, because it can be changed into another prime (129393967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64696988 + 64696989.

It is an arithmetic number, because the mean of its divisors is an integer number (64696989).

Almost surely, 2^129393977 is an apocalyptic number.

It is an amenable number.

129393977 is a deficient number, since it is larger than the sum of its proper divisors (1).

129393977 is an equidigital number, since it uses as much as digits as its factorization.

129393977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 642978, while the sum is 50.

The square root of 129393977 is about 11375.1473397051. The cubic root of 129393977 is about 505.7912987376.

The spelling of 129393977 in words is "one hundred twenty-nine million, three hundred ninety-three thousand, nine hundred seventy-seven".