129424643 has 2 divisors, whose sum is σ = 129424644. Its totient is φ = 129424642.

The previous prime is 129424613. The next prime is 129424661. The reversal of 129424643 is 346424921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129424643 - 2⁸ = 129424387 is a prime.

It is not a weakly prime, because it can be changed into another prime (129424613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64712321 + 64712322.

It is an arithmetic number, because the mean of its divisors is an integer number (64712322).

Almost surely, 2^129424643 is an apocalyptic number.

129424643 is a deficient number, since it is larger than the sum of its proper divisors (1).

129424643 is an equidigital number, since it uses as much as digits as its factorization.

129424643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 35.

The square root of 129424643 is about 11376.4951984344. The cubic root of 129424643 is about 505.8312526086.

The spelling of 129424643 in words is "one hundred twenty-nine million, four hundred twenty-four thousand, six hundred forty-three".