129231701 has 2 divisors, whose sum is σ = 129231702. Its totient is φ = 129231700.

The previous prime is 129231607. The next prime is 129231703. The reversal of 129231701 is 107132921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120670225 + 8561476 = 10985^2 + 2926^2 .

It is a cyclic number.

It is not a de Polignac number, because 129231701 - 2¹⁸ = 128969557 is a prime.

Together with 129231703, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129231703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64615850 + 64615851.

It is an arithmetic number, because the mean of its divisors is an integer number (64615851).

Almost surely, 2^129231701 is an apocalyptic number.

It is an amenable number.

129231701 is a deficient number, since it is larger than the sum of its proper divisors (1).

129231701 is an equidigital number, since it uses as much as digits as its factorization.

129231701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 129231701 is about 11368.0121833151. The cubic root of 129231701 is about 505.5797687357.

The spelling of 129231701 in words is "one hundred twenty-nine million, two hundred thirty-one thousand, seven hundred one".