129834521 has 2 divisors, whose sum is σ = 129834522. Its totient is φ = 129834520.

The previous prime is 129834511. The next prime is 129834533. The reversal of 129834521 is 125438921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93702400 + 36132121 = 9680^2 + 6011^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129834521 is a prime.

It is a Sophie Germain prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (129834511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64917260 + 64917261.

It is an arithmetic number, because the mean of its divisors is an integer number (64917261).

Almost surely, 2^129834521 is an apocalyptic number.

It is an amenable number.

129834521 is a deficient number, since it is larger than the sum of its proper divisors (1).

129834521 is an equidigital number, since it uses as much as digits as its factorization.

129834521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 35.

The square root of 129834521 is about 11394.4952060194. The cubic root of 129834521 is about 506.3646662782.

The spelling of 129834521 in words is "one hundred twenty-nine million, eight hundred thirty-four thousand, five hundred twenty-one".