145222172 has 12 divisors (see below), whose sum is σ = 256606896. Its totient is φ = 71905920.

The previous prime is 145222171. The next prime is 145222183. The reversal of 145222172 is 271222541.

145222172 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145222171) 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, 175829 + ... + 176652.

It is an arithmetic number, because the mean of its divisors is an integer number (21383908).

Almost surely, 2^145222172 is an apocalyptic number.

It is an amenable number.

145222172 is a deficient number, since it is larger than the sum of its proper divisors (111384724).

145222172 is a wasteful number, since it uses less digits than its factorization.

145222172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352588 (or 352586 counting only the distinct ones).

The product of its digits is 2240, while the sum is 26.

The square root of 145222172 is about 12050.8162379152. The cubic root of 145222172 is about 525.6269721908.

The spelling of 145222172 in words is "one hundred forty-five million, two hundred twenty-two thousand, one hundred seventy-two".