145420509 has 24 divisors (see below), whose sum is σ = 220296160. Its totient is φ = 84588192.

The previous prime is 145420493. The next prime is 145420553. The reversal of 145420509 is 905024541.

It is not a de Polignac number, because 145420509 - 2⁴ = 145420493 is a prime.

It is a super-2 number, since 2×145420509² = 42294248875638162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145420589) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 328042 + ... + 328484.

Almost surely, 2^145420509 is an apocalyptic number.

145420509 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

145420509 is a deficient number, since it is larger than the sum of its proper divisors (74875651).

145420509 is an equidigital number, since it uses as much as digits as its factorization.

145420509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 921 (or 478 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 145420509 is about 12059.0426236912. The cubic root of 145420509 is about 525.8661547963.

The spelling of 145420509 in words is "one hundred forty-five million, four hundred twenty thousand, five hundred nine".