145521075 has 24 divisors (see below), whose sum is σ = 274966528. Its totient is φ = 66523680.

The previous prime is 145521067. The next prime is 145521091. The reversal of 145521075 is 570125541.

It is not a de Polignac number, because 145521075 - 2³ = 145521067 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 138067 + ... + 139116.

Almost surely, 2^145521075 is an apocalyptic number.

145521075 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

145521075 is a deficient number, since it is larger than the sum of its proper divisors (129445453).

145521075 is a wasteful number, since it uses less digits than its factorization.

145521075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277203 (or 277198 counting only the distinct ones).

The product of its (nonzero) digits is 7000, while the sum is 30.

The square root of 145521075 is about 12063.2116370393. The cubic root of 145521075 is about 525.9873483153.

The spelling of 145521075 in words is "one hundred forty-five million, five hundred twenty-one thousand, seventy-five".