145555509 has 32 divisors (see below), whose sum is σ = 219783168. Its totient is φ = 84888000.

The previous prime is 145555499. The next prime is 145555511. The reversal of 145555509 is 905555541.

It is not a de Polignac number, because 145555509 - 2⁴ = 145555493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145555909) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 268779 + ... + 269319.

It is an arithmetic number, because the mean of its divisors is an integer number (6868224).

Almost surely, 2^145555509 is an apocalyptic number.

It is an amenable number.

145555509 is a deficient number, since it is larger than the sum of its proper divisors (74227659).

145555509 is a wasteful number, since it uses less digits than its factorization.

145555509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 849.

The product of its (nonzero) digits is 112500, while the sum is 39.

The square root of 145555509 is about 12064.6387844809. The cubic root of 145555509 is about 526.0288323866.

The spelling of 145555509 in words is "one hundred forty-five million, five hundred fifty-five thousand, five hundred nine".