145521173 has 16 divisors (see below), whose sum is σ = 178988544. Its totient is φ = 115464960.

The previous prime is 145521169. The next prime is 145521191. The reversal of 145521173 is 371125541.

It is a cyclic number.

It is not a de Polignac number, because 145521173 - 2² = 145521169 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145521113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2765 + ... + 17282.

It is an arithmetic number, because the mean of its divisors is an integer number (11186784).

Almost surely, 2^145521173 is an apocalyptic number.

It is an amenable number.

145521173 is a deficient number, since it is larger than the sum of its proper divisors (33467371).

145521173 is a wasteful number, since it uses less digits than its factorization.

145521173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20132.

The product of its digits is 4200, while the sum is 29.

The square root of 145521173 is about 12063.2156989751. The cubic root of 145521173 is about 525.9874663892.

The spelling of 145521173 in words is "one hundred forty-five million, five hundred twenty-one thousand, one hundred seventy-three".