145532221 has 8 divisors (see below), whose sum is σ = 147216384. Its totient is φ = 143856720.

The previous prime is 145532207. The next prime is 145532227. The reversal of 145532221 is 122235541.

145532221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 145532221 - 2¹¹ = 145530173 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 (145532227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35256 + ... + 39166.

It is an arithmetic number, because the mean of its divisors is an integer number (18402048).

Almost surely, 2^145532221 is an apocalyptic number.

It is an amenable number.

145532221 is a deficient number, since it is larger than the sum of its proper divisors (1684163).

145532221 is a wasteful number, since it uses less digits than its factorization.

145532221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4331.

The product of its digits is 2400, while the sum is 25.

The square root of 145532221 is about 12063.6736113010. The cubic root of 145532221 is about 526.0007770811. Note that the first 3 decimals are identical.

Adding to 145532221 its reverse (122235541), we get a palindrome (267767762).

The spelling of 145532221 in words is "one hundred forty-five million, five hundred thirty-two thousand, two hundred twenty-one".