145314221 has 8 divisors (see below), whose sum is σ = 157359384. Its totient is φ = 133392960.

The previous prime is 145314217. The next prime is 145314263. The reversal of 145314221 is 122413541.

It can be written as a sum of positive squares in 4 ways, for example, as 16491721 + 128822500 = 4061^2 + 11350^2 .

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 145314221 - 2² = 145314217 is a prime.

It is a super-2 number, since 2×145314221² = 42232445649673682, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145314821) 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 7 ways as a sum of consecutive naturals, for example, 28526 + ... + 33231.

It is an arithmetic number, because the mean of its divisors is an integer number (19669923).

Almost surely, 2^145314221 is an apocalyptic number.

It is an amenable number.

145314221 is a deficient number, since it is larger than the sum of its proper divisors (12045163).

145314221 is a wasteful number, since it uses less digits than its factorization.

145314221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61951.

The product of its digits is 960, while the sum is 23.

The square root of 145314221 is about 12054.6348347845. The cubic root of 145314221 is about 525.7380048646.

Adding to 145314221 its reverse (122413541), we get a palindrome (267727762).

The spelling of 145314221 in words is "one hundred forty-five million, three hundred fourteen thousand, two hundred twenty-one".