129497457 has 4 divisors (see below), whose sum is σ = 172663280. Its totient is φ = 86331636.

The previous prime is 129497419. The next prime is 129497477. The reversal of 129497457 is 754794921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 754794921 = 3 ⋅251598307.

It is not a de Polignac number, because 129497457 - 2¹² = 129493361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129497477) 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, 21582907 + ... + 21582912.

It is an arithmetic number, because the mean of its divisors is an integer number (43165820).

Almost surely, 2^129497457 is an apocalyptic number.

It is an amenable number.

129497457 is a deficient number, since it is larger than the sum of its proper divisors (43165823).

129497457 is an equidigital number, since it uses as much as digits as its factorization.

129497457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43165822.

The product of its digits is 635040, while the sum is 48.

The square root of 129497457 is about 11379.6949431872. The cubic root of 129497457 is about 505.9260946496.

The spelling of 129497457 in words is "one hundred twenty-nine million, four hundred ninety-seven thousand, four hundred fifty-seven".