145454321 has 4 divisors (see below), whose sum is σ = 145653492. Its totient is φ = 145255152.

The previous prime is 145454299. The next prime is 145454333. The reversal of 145454321 is 123454541.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 108972721 + 36481600 = 10439^2 + 6040^2 .

It is a cyclic number.

It is not a de Polignac number, because 145454321 - 2²² = 141260017 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145454341) 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, 98486 + ... + 99951.

It is an arithmetic number, because the mean of its divisors is an integer number (36413373).

Almost surely, 2^145454321 is an apocalyptic number.

It is an amenable number.

145454321 is a deficient number, since it is larger than the sum of its proper divisors (199171).

145454321 is an equidigital number, since it uses as much as digits as its factorization.

145454321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199170.

The product of its digits is 9600, while the sum is 29.

The square root of 145454321 is about 12060.4444777131. Note that the first 4 decimals coincide. The cubic root of 145454321 is about 525.9069083522.

The spelling of 145454321 in words is "one hundred forty-five million, four hundred fifty-four thousand, three hundred twenty-one".