145724509 has 12 divisors (see below), whose sum is σ = 175772064. Its totient is φ = 118330632.

The previous prime is 145724497. The next prime is 145724539. The reversal of 145724509 is 905427541.

It is not a de Polignac number, because 145724509 - 2²³ = 137335901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145724539) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26307 + ... + 31360.

It is an arithmetic number, because the mean of its divisors is an integer number (14647672).

Almost surely, 2^145724509 is an apocalyptic number.

145724509 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

145724509 is a deficient number, since it is larger than the sum of its proper divisors (30047555).

145724509 is an equidigital number, since it uses as much as digits as its factorization.

145724509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57712 (or 57693 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 37.

The square root of 145724509 is about 12071.6406921346. The cubic root of 145724509 is about 526.2323389149.

The spelling of 145724509 in words is "one hundred forty-five million, seven hundred twenty-four thousand, five hundred nine".