145549169 has 2 divisors, whose sum is σ = 145549170. Its totient is φ = 145549168.

The previous prime is 145549163. The next prime is 145549171. The reversal of 145549169 is 961945541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87179569 + 58369600 = 9337^2 + 7640^2 .

It is an emirp because it is prime and its reverse (961945541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145549169 - 2⁴ = 145549153 is a prime.

It is a super-2 number, since 2×145549169² = 42369121193181122, which contains 22 as substring.

Together with 145549171, 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 (145549163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72774584 + 72774585.

It is an arithmetic number, because the mean of its divisors is an integer number (72774585).

Almost surely, 2^145549169 is an apocalyptic number.

It is an amenable number.

145549169 is a deficient number, since it is larger than the sum of its proper divisors (1).

145549169 is an equidigital number, since it uses as much as digits as its factorization.

145549169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 194400, while the sum is 44.

The square root of 145549169 is about 12064.3760302802. The cubic root of 145549169 is about 526.0211948165.

The spelling of 145549169 in words is "one hundred forty-five million, five hundred forty-nine thousand, one hundred sixty-nine".