129942497 has 6 divisors (see below), whose sum is σ = 131157558. Its totient is φ = 128738592.

The previous prime is 129942473. The next prime is 129942499. The reversal of 129942497 is 794249921.

It can be written as a sum of positive squares in 3 ways, for example, as 77510416 + 52432081 = 8804^2 + 7241^2 .

It is not a de Polignac number, because 129942497 - 2¹⁰ = 129941473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129942499) by changing a digit.

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, 6413 + ... + 17349.

It is an arithmetic number, because the mean of its divisors is an integer number (21859593).

Almost surely, 2^129942497 is an apocalyptic number.

It is an amenable number.

129942497 is a deficient number, since it is larger than the sum of its proper divisors (1215061).

129942497 is an equidigital number, since it uses as much as digits as its factorization.

129942497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11155 (or 11046 counting only the distinct ones).

The product of its digits is 326592, while the sum is 47.

The square root of 129942497 is about 11399.2322987120. The cubic root of 129942497 is about 506.5049989648.

The spelling of 129942497 in words is "one hundred twenty-nine million, nine hundred forty-two thousand, four hundred ninety-seven".