145224809 has 4 divisors (see below), whose sum is σ = 152868240. Its totient is φ = 137581380.

The previous prime is 145224797. The next prime is 145224853. The reversal of 145224809 is 908422541.

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: 908422541 = 13 ⋅69878657.

It is a cyclic number.

It is not a de Polignac number, because 145224809 - 2²⁰ = 144176233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145224869) 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, 3821687 + ... + 3821724.

It is an arithmetic number, because the mean of its divisors is an integer number (38217060).

Almost surely, 2^145224809 is an apocalyptic number.

145224809 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

145224809 is a deficient number, since it is larger than the sum of its proper divisors (7643431).

145224809 is an equidigital number, since it uses as much as digits as its factorization.

145224809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7643430.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 145224809 is about 12050.9256490943. The cubic root of 145224809 is about 525.6301536837.

The spelling of 145224809 in words is "one hundred forty-five million, two hundred twenty-four thousand, eight hundred nine".