145521169 has 2 divisors, whose sum is σ = 145521170. Its totient is φ = 145521168.

The previous prime is 145521163. The next prime is 145521191. The reversal of 145521169 is 961125541.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143712144 + 1809025 = 11988^2 + 1345^2 .

It is a cyclic number.

It is not a de Polignac number, because 145521169 - 2⁵ = 145521137 is a prime.

It is a super-2 number, since 2×145521169² = 42352821254253122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (145521163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72760584 + 72760585.

It is an arithmetic number, because the mean of its divisors is an integer number (72760585).

Almost surely, 2^145521169 is an apocalyptic number.

It is an amenable number.

145521169 is a deficient number, since it is larger than the sum of its proper divisors (1).

145521169 is an equidigital number, since it uses as much as digits as its factorization.

145521169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800, while the sum is 34.

The square root of 145521169 is about 12063.2155331819. The cubic root of 145521169 is about 525.9874615699.

The spelling of 145521169 in words is "one hundred forty-five million, five hundred twenty-one thousand, one hundred sixty-nine".