265129009 has 4 divisors (see below), whose sum is σ = 265186816. Its totient is φ = 265071204.

The previous prime is 265129003. The next prime is 265129031. The reversal of 265129009 is 900921562.

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.

It is a cyclic number.

It is not a de Polignac number, because 265129009 - 2⁷ = 265128881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (265129003) 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, 21369 + ... + 31414.

It is an arithmetic number, because the mean of its divisors is an integer number (66296704).

Almost surely, 2^265129009 is an apocalyptic number.

It is an amenable number.

265129009 is a deficient number, since it is larger than the sum of its proper divisors (57807).

265129009 is an equidigital number, since it uses as much as digits as its factorization.

265129009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57806.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 265129009 is about 16282.7825938935. The cubic root of 265129009 is about 642.4200440506.

The spelling of 265129009 in words is "two hundred sixty-five million, one hundred twenty-nine thousand, nine".