144721345 has 4 divisors (see below), whose sum is σ = 173665620. Its totient is φ = 115777072.

The previous prime is 144721327. The next prime is 144721351. The reversal of 144721345 is 543127441.

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 82737216 + 61984129 = 9096^2 + 7873^2 .

It is a cyclic number.

It is not a de Polignac number, because 144721345 - 2¹¹ = 144719297 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14472130 + ... + 14472139.

It is an arithmetic number, because the mean of its divisors is an integer number (43416405).

Almost surely, 2^144721345 is an apocalyptic number.

It is an amenable number.

144721345 is a deficient number, since it is larger than the sum of its proper divisors (28944275).

144721345 is an equidigital number, since it uses as much as digits as its factorization.

144721345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28944274.

The product of its digits is 13440, while the sum is 31.

The square root of 144721345 is about 12030.0184954139. The cubic root of 144721345 is about 525.0220338447.

Adding to 144721345 its reverse (543127441), we get a palindrome (687848786).

The spelling of 144721345 in words is "one hundred forty-four million, seven hundred twenty-one thousand, three hundred forty-five".