129925569 has 4 divisors (see below), whose sum is σ = 173234096. Its totient is φ = 86617044.

The previous prime is 129925567. The next prime is 129925613. The reversal of 129925569 is 965529921.

It is a happy number.

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: 965529921 = 3 ⋅321843307.

It is not a de Polignac number, because 129925569 - 2¹ = 129925567 is a prime.

It is a super-2 number, since 2×129925569² = 33761306959947522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (129925567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21654259 + ... + 21654264.

It is an arithmetic number, because the mean of its divisors is an integer number (43308524).

Almost surely, 2^129925569 is an apocalyptic number.

It is an amenable number.

129925569 is a deficient number, since it is larger than the sum of its proper divisors (43308527).

129925569 is an equidigital number, since it uses as much as digits as its factorization.

129925569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43308526.

The product of its digits is 437400, while the sum is 48.

The square root of 129925569 is about 11398.4897683860. The cubic root of 129925569 is about 506.4830033663.

The spelling of 129925569 in words is "one hundred twenty-nine million, nine hundred twenty-five thousand, five hundred sixty-nine".