129859901 has 2 divisors, whose sum is σ = 129859902. Its totient is φ = 129859900.

The previous prime is 129859897. The next prime is 129859943. The reversal of 129859901 is 109958921.

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., 83265625 + 46594276 = 9125^2 + 6826^2 .

It is an emirp because it is prime and its reverse (109958921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129859901 - 2² = 129859897 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129859201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64929950 + 64929951.

It is an arithmetic number, because the mean of its divisors is an integer number (64929951).

Almost surely, 2^129859901 is an apocalyptic number.

It is an amenable number.

129859901 is a deficient number, since it is larger than the sum of its proper divisors (1).

129859901 is an equidigital number, since it uses as much as digits as its factorization.

129859901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 44.

The square root of 129859901 is about 11395.6088472710. The cubic root of 129859901 is about 506.3976587823.

The spelling of 129859901 in words is "one hundred twenty-nine million, eight hundred fifty-nine thousand, nine hundred one".