145402217 has 2 divisors, whose sum is σ = 145402218. Its totient is φ = 145402216.

The previous prime is 145402163. The next prime is 145402273. The reversal of 145402217 is 712204541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136515856 + 8886361 = 11684^2 + 2981^2 .

It is an emirp because it is prime and its reverse (712204541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145402217 - 2²⁶ = 78293353 is a prime.

It is a super-2 number, since 2×145402217² = 42283609417030178, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (145402417) 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 as a sum of consecutive naturals, namely, 72701108 + 72701109.

It is an arithmetic number, because the mean of its divisors is an integer number (72701109).

Almost surely, 2^145402217 is an apocalyptic number.

It is an amenable number.

145402217 is a deficient number, since it is larger than the sum of its proper divisors (1).

145402217 is an equidigital number, since it uses as much as digits as its factorization.

145402217 is an odious number, because the sum of its binary digits is odd.

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

The square root of 145402217 is about 12058.2841648387. The cubic root of 145402217 is about 525.8441048413.

Adding to 145402217 its reverse (712204541), we get a palindrome (857606758).

The spelling of 145402217 in words is "one hundred forty-five million, four hundred two thousand, two hundred seventeen".