145220145 has 32 divisors (see below), whose sum is σ = 266284800. Its totient is φ = 66201600.

The previous prime is 145220129. The next prime is 145220147. The reversal of 145220145 is 541022541.

It is not a de Polignac number, because 145220145 - 2⁴ = 145220129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (145220147) 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 31 ways as a sum of consecutive naturals, for example, 40381 + ... + 43829.

It is an arithmetic number, because the mean of its divisors is an integer number (8321400).

Almost surely, 2^145220145 is an apocalyptic number.

145220145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

145220145 is a deficient number, since it is larger than the sum of its proper divisors (121064655).

145220145 is a wasteful number, since it uses less digits than its factorization.

145220145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3865.

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 145220145 is about 12050.7321354348. The cubic root of 145220145 is about 525.6245266257.

Adding to 145220145 its reverse (541022541), we get a palindrome (686242686).

The spelling of 145220145 in words is "one hundred forty-five million, two hundred twenty thousand, one hundred forty-five".