145215173 has 4 divisors (see below), whose sum is σ = 153757260. Its totient is φ = 136673088.

The previous prime is 145215167. The next prime is 145215181. The reversal of 145215173 is 371512541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 371512541 = 71 ⋅5232571.

It can be written as a sum of positive squares in 2 ways, for example, as 68442529 + 76772644 = 8273^2 + 8762^2 .

It is a cyclic number.

It is not a de Polignac number, because 145215173 - 2¹⁶ = 145149637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145215113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4271018 + ... + 4271051.

It is an arithmetic number, because the mean of its divisors is an integer number (38439315).

Almost surely, 2^145215173 is an apocalyptic number.

It is an amenable number.

145215173 is a deficient number, since it is larger than the sum of its proper divisors (8542087).

145215173 is an equidigital number, since it uses as much as digits as its factorization.

145215173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8542086.

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

The square root of 145215173 is about 12050.5258391491. The cubic root of 145215173 is about 525.6185278368.

The spelling of 145215173 in words is "one hundred forty-five million, two hundred fifteen thousand, one hundred seventy-three".