129897469 has 4 divisors (see below), whose sum is σ = 139889596. Its totient is φ = 119905344.

The previous prime is 129897463. The next prime is 129897473. The reversal of 129897469 is 964798921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 964798921 = 41 ⋅23531681.

It can be written as a sum of positive squares in 2 ways, for example, as 63393444 + 66504025 = 7962^2 + 8155^2 .

It is not a de Polignac number, because 129897469 - 2¹⁵ = 129864701 is a prime.

It is a super-2 number, since 2×129897469² = 33746704905211922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129897463) 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, 4996044 + ... + 4996069.

It is an arithmetic number, because the mean of its divisors is an integer number (34972399).

Almost surely, 2^129897469 is an apocalyptic number.

It is an amenable number.

129897469 is a deficient number, since it is larger than the sum of its proper divisors (9992127).

129897469 is an equidigital number, since it uses as much as digits as its factorization.

129897469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9992126.

The product of its digits is 1959552, while the sum is 55.

The square root of 129897469 is about 11397.2570822984. The cubic root of 129897469 is about 506.4464870781.

The spelling of 129897469 in words is "one hundred twenty-nine million, eight hundred ninety-seven thousand, four hundred sixty-nine".