129531497 has 2 divisors, whose sum is σ = 129531498. Its totient is φ = 129531496.

The previous prime is 129531443. The next prime is 129531499. The reversal of 129531497 is 794135921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107101801 + 22429696 = 10349^2 + 4736^2 .

It is a cyclic number.

It is not a de Polignac number, because 129531497 - 2¹⁰ = 129530473 is a prime.

It is a super-2 number, since 2×129531497² = 33556817430122018, which contains 22 as substring.

Together with 129531499, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (129531499) 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 as a sum of consecutive naturals, namely, 64765748 + 64765749.

It is an arithmetic number, because the mean of its divisors is an integer number (64765749).

Almost surely, 2^129531497 is an apocalyptic number.

It is an amenable number.

129531497 is a deficient number, since it is larger than the sum of its proper divisors (1).

129531497 is an equidigital number, since it uses as much as digits as its factorization.

129531497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 41.

The square root of 129531497 is about 11381.1904913326. The cubic root of 129531497 is about 505.9704203990.

The spelling of 129531497 in words is "one hundred twenty-nine million, five hundred thirty-one thousand, four hundred ninety-seven".