129947425 has 6 divisors (see below), whose sum is σ = 161134838. Its totient is φ = 103957920.

The previous prime is 129947417. The next prime is 129947449. The reversal of 129947425 is 524749921.

It can be written as a sum of positive squares in 3 ways, for example, as 1079521 + 128867904 = 1039^2 + 11352^2 .

It is not a de Polignac number, because 129947425 - 2³ = 129947417 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2598924 + ... + 2598973.

Almost surely, 2^129947425 is an apocalyptic number.

It is an amenable number.

129947425 is a deficient number, since it is larger than the sum of its proper divisors (31187413).

129947425 is an equidigital number, since it uses as much as digits as its factorization.

129947425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5197907 (or 5197902 counting only the distinct ones).

The product of its digits is 181440, while the sum is 43.

The square root of 129947425 is about 11399.4484515699. The cubic root of 129947425 is about 506.5114018613.

The spelling of 129947425 in words is "one hundred twenty-nine million, nine hundred forty-seven thousand, four hundred twenty-five".