129203953 has 4 divisors (see below), whose sum is σ = 129262500. Its totient is φ = 129145408.

The previous prime is 129203929. The next prime is 129203957. The reversal of 129203953 is 359302921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 94711824 + 34492129 = 9732^2 + 5873^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129203953 is a prime.

It is a super-2 number, since 2×129203953² = 33387322941652418, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129203957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25828 + ... + 30421.

It is an arithmetic number, because the mean of its divisors is an integer number (32315625).

Almost surely, 2^129203953 is an apocalyptic number.

It is an amenable number.

129203953 is a deficient number, since it is larger than the sum of its proper divisors (58547).

129203953 is an equidigital number, since it uses as much as digits as its factorization.

129203953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58546.

The product of its (nonzero) digits is 14580, while the sum is 34.

The square root of 129203953 is about 11366.7916757544. The cubic root of 129203953 is about 505.5435809389.

The spelling of 129203953 in words is "one hundred twenty-nine million, two hundred three thousand, nine hundred fifty-three".