129071623 has 2 divisors, whose sum is σ = 129071624. Its totient is φ = 129071622.

The previous prime is 129071603. The next prime is 129071641. The reversal of 129071623 is 326170921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129071623 - 2¹⁷ = 128940551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129071603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64535811 + 64535812.

It is an arithmetic number, because the mean of its divisors is an integer number (64535812).

Almost surely, 2^129071623 is an apocalyptic number.

129071623 is a deficient number, since it is larger than the sum of its proper divisors (1).

129071623 is an equidigital number, since it uses as much as digits as its factorization.

129071623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 129071623 is about 11360.9692808316. The cubic root of 129071623 is about 505.3709303025.

The spelling of 129071623 in words is "one hundred twenty-nine million, seventy-one thousand, six hundred twenty-three".