145532213 has 4 divisors (see below), whose sum is σ = 146973228. Its totient is φ = 144091200.

The previous prime is 145532207. The next prime is 145532227. The reversal of 145532213 is 312235541.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 92198404 + 53333809 = 9602^2 + 7303^2 .

It is a cyclic number.

It is not a de Polignac number, because 145532213 - 2²⁰ = 144483637 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 (145532203) 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 3 ways as a sum of consecutive naturals, for example, 720356 + ... + 720557.

It is an arithmetic number, because the mean of its divisors is an integer number (36743307).

Almost surely, 2^145532213 is an apocalyptic number.

It is an amenable number.

145532213 is a deficient number, since it is larger than the sum of its proper divisors (1441015).

145532213 is a wasteful number, since it uses less digits than its factorization.

145532213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1441014.

The product of its digits is 3600, while the sum is 26.

The square root of 145532213 is about 12063.6732797270. The cubic root of 145532213 is about 526.0007674429. Note that the first 3 decimals are identical.

Adding to 145532213 its reverse (312235541), we get a palindrome (457767754).

The spelling of 145532213 in words is "one hundred forty-five million, five hundred thirty-two thousand, two hundred thirteen".