145023449 has 4 divisors (see below), whose sum is σ = 145048080. Its totient is φ = 144998820.

The previous prime is 145023421. The next prime is 145023491. The reversal of 145023449 is 944320541.

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: 944320541 = 293 ⋅3222937.

It is a cyclic number.

It is not a de Polignac number, because 145023449 - 2²⁴ = 128246233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145023499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2294 + ... + 17184.

It is an arithmetic number, because the mean of its divisors is an integer number (36262020).

Almost surely, 2^145023449 is an apocalyptic number.

It is an amenable number.

145023449 is a deficient number, since it is larger than the sum of its proper divisors (24631).

145023449 is an equidigital number, since it uses as much as digits as its factorization.

145023449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24630.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 145023449 is about 12042.5682061593. The cubic root of 145023449 is about 525.3871055808.

The spelling of 145023449 in words is "one hundred forty-five million, twenty-three thousand, four hundred forty-nine".