145532215 has 4 divisors (see below), whose sum is σ = 174638664. Its totient is φ = 116425768.

The previous prime is 145532207. The next prime is 145532227. The reversal of 145532215 is 512235541.

145532215 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 512235541 = 2039 ⋅251219.

It is a cyclic number.

It is not a de Polignac number, because 145532215 - 2³ = 145532207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14553217 + ... + 14553226.

It is an arithmetic number, because the mean of its divisors is an integer number (43659666).

Almost surely, 2^145532215 is an apocalyptic number.

145532215 is a deficient number, since it is larger than the sum of its proper divisors (29106449).

145532215 is an equidigital number, since it uses as much as digits as its factorization.

145532215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29106448.

The product of its digits is 6000, while the sum is 28.

The square root of 145532215 is about 12063.6733626205. The cubic root of 145532215 is about 526.0007698524. Note that the first 3 decimals are identical.

Adding to 145532215 its reverse (512235541), we get a palindrome (657767756).

It can be divided in two parts, 1455 and 32215, that added together give a triangular number (33670 = T₂₅₉).

The spelling of 145532215 in words is "one hundred forty-five million, five hundred thirty-two thousand, two hundred fifteen".