145257009 has 4 divisors (see below), whose sum is σ = 193676016. Its totient is φ = 96838004.

The previous prime is 145257001. The next prime is 145257023. The reversal of 145257009 is 900752541.

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 145257009 - 2³ = 145257001 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (145257001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24209499 + ... + 24209504.

It is an arithmetic number, because the mean of its divisors is an integer number (48419004).

Almost surely, 2^145257009 is an apocalyptic number.

It is an amenable number.

145257009 is a deficient number, since it is larger than the sum of its proper divisors (48419007).

145257009 is an equidigital number, since it uses as much as digits as its factorization.

145257009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48419006.

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 145257009 is about 12052.2615720038. The cubic root of 145257009 is about 525.6689992967.

The spelling of 145257009 in words is "one hundred forty-five million, two hundred fifty-seven thousand, nine".