129242573 has 2 divisors, whose sum is σ = 129242574. Its totient is φ = 129242572.

The previous prime is 129242569. The next prime is 129242587. The reversal of 129242573 is 375242921.

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., 123587689 + 5654884 = 11117^2 + 2378^2 .

It is a cyclic number.

It is not a de Polignac number, because 129242573 - 2² = 129242569 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129242173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64621286 + 64621287.

It is an arithmetic number, because the mean of its divisors is an integer number (64621287).

Almost surely, 2^129242573 is an apocalyptic number.

It is an amenable number.

129242573 is a deficient number, since it is larger than the sum of its proper divisors (1).

129242573 is an equidigital number, since it uses as much as digits as its factorization.

129242573 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 35.

The square root of 129242573 is about 11368.4903571231. The cubic root of 129242573 is about 505.5939461371.

It can be divided in two parts, 1292 and 42573, that multiplied together give a triangular number (55004316 = T₁₀₄₈₈).

The spelling of 129242573 in words is "one hundred twenty-nine million, two hundred forty-two thousand, five hundred seventy-three".