145521213 has 8 divisors (see below), whose sum is σ = 195808800. Its totient is φ = 96123888.

The previous prime is 145521191. The next prime is 145521221. The reversal of 145521213 is 312125541.

It is a happy number.

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

It is not a de Polignac number, because 145521213 - 2⁶ = 145521149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145521293) 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, 222183 + ... + 222836.

It is an arithmetic number, because the mean of its divisors is an integer number (24476100).

Almost surely, 2^145521213 is an apocalyptic number.

It is an amenable number.

145521213 is a deficient number, since it is larger than the sum of its proper divisors (50287587).

145521213 is a wasteful number, since it uses less digits than its factorization.

145521213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445131.

The product of its digits is 1200, while the sum is 24.

The square root of 145521213 is about 12063.2173569077. The cubic root of 145521213 is about 525.9875145827.

Adding to 145521213 its reverse (312125541), we get a palindrome (457646754).

The spelling of 145521213 in words is "one hundred forty-five million, five hundred twenty-one thousand, two hundred thirteen".