145505215 has 4 divisors (see below), whose sum is σ = 174606264. Its totient is φ = 116404168.

The previous prime is 145505207. The next prime is 145505221. The reversal of 145505215 is 512505541.

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

It is a cyclic number.

It is not a de Polignac number, because 145505215 - 2³ = 145505207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14550517 + ... + 14550526.

It is an arithmetic number, because the mean of its divisors is an integer number (43651566).

Almost surely, 2^145505215 is an apocalyptic number.

145505215 is a deficient number, since it is larger than the sum of its proper divisors (29101049).

145505215 is an equidigital number, since it uses as much as digits as its factorization.

145505215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29101048.

The product of its (nonzero) digits is 5000, while the sum is 28.

The square root of 145505215 is about 12062.5542485827. The cubic root of 145505215 is about 525.9682389127.

The spelling of 145505215 in words is "one hundred forty-five million, five hundred five thousand, two hundred fifteen".