145172223 has 16 divisors (see below), whose sum is σ = 245794560. Its totient is φ = 82955448.

The previous prime is 145172219. The next prime is 145172233. The reversal of 145172223 is 322271541.

It is not a de Polignac number, because 145172223 - 2² = 145172219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145172233) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 383865 + ... + 384242.

It is an arithmetic number, because the mean of its divisors is an integer number (15362160).

Almost surely, 2^145172223 is an apocalyptic number.

145172223 is a deficient number, since it is larger than the sum of its proper divisors (100622337).

145172223 is an equidigital number, since it uses as much as digits as its factorization.

145172223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768123 (or 768117 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 145172223 is about 12048.7436274493. The cubic root of 145172223 is about 525.5667023484.

The spelling of 145172223 in words is "one hundred forty-five million, one hundred seventy-two thousand, two hundred twenty-three".