145240217 has 2 divisors, whose sum is σ = 145240218. Its totient is φ = 145240216.

The previous prime is 145240201. The next prime is 145240219. The reversal of 145240217 is 712042541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123187801 + 22052416 = 11099^2 + 4696^2 .

It is a cyclic number.

It is not a de Polignac number, because 145240217 - 2⁴ = 145240201 is a prime.

Together with 145240219, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (145240219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72620108 + 72620109.

It is an arithmetic number, because the mean of its divisors is an integer number (72620109).

Almost surely, 2^145240217 is an apocalyptic number.

It is an amenable number.

145240217 is a deficient number, since it is larger than the sum of its proper divisors (1).

145240217 is an equidigital number, since it uses as much as digits as its factorization.

145240217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 145240217 is about 12051.5649191298. The cubic root of 145240217 is about 525.6487423878.

Adding to 145240217 its reverse (712042541), we get a palindrome (857282758).

The spelling of 145240217 in words is "one hundred forty-five million, two hundred forty thousand, two hundred seventeen".