145596221 has 16 divisors (see below), whose sum is σ = 159672960. Its totient is φ = 132269760.

The previous prime is 145596179. The next prime is 145596239. The reversal of 145596221 is 122695541.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145596221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145596421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48455 + ... + 51371.

It is an arithmetic number, because the mean of its divisors is an integer number (9979560).

Almost surely, 2^145596221 is an apocalyptic number.

It is an amenable number.

145596221 is a deficient number, since it is larger than the sum of its proper divisors (14076739).

145596221 is a wasteful number, since it uses less digits than its factorization.

145596221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3044.

The product of its digits is 21600, while the sum is 35.

The square root of 145596221 is about 12066.3259113949. The cubic root of 145596221 is about 526.0778713858.

The spelling of 145596221 in words is "one hundred forty-five million, five hundred ninety-six thousand, two hundred twenty-one".