129642547 has 2 divisors, whose sum is σ = 129642548. Its totient is φ = 129642546.

The previous prime is 129642503. The next prime is 129642551. The reversal of 129642547 is 745246921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129642547 - 2¹¹ = 129640499 is a prime.

It is not a weakly prime, because it can be changed into another prime (129642577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64821273 + 64821274.

It is an arithmetic number, because the mean of its divisors is an integer number (64821274).

Almost surely, 2^129642547 is an apocalyptic number.

129642547 is a deficient number, since it is larger than the sum of its proper divisors (1).

129642547 is an equidigital number, since it uses as much as digits as its factorization.

129642547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 40.

The square root of 129642547 is about 11386.0681097559. The cubic root of 129642547 is about 506.1149720257.

The spelling of 129642547 in words is "one hundred twenty-nine million, six hundred forty-two thousand, five hundred forty-seven".