145509449 has 2 divisors, whose sum is σ = 145509450. Its totient is φ = 145509448.

The previous prime is 145509437. The next prime is 145509457. The reversal of 145509449 is 944905541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 127531849 + 17977600 = 11293^2 + 4240^2 .

It is a cyclic number.

It is not a de Polignac number, because 145509449 - 2¹⁶ = 145443913 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (145509499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72754724 + 72754725.

It is an arithmetic number, because the mean of its divisors is an integer number (72754725).

Almost surely, 2^145509449 is an apocalyptic number.

It is an amenable number.

145509449 is a deficient number, since it is larger than the sum of its proper divisors (1).

145509449 is an equidigital number, since it uses as much as digits as its factorization.

145509449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129600, while the sum is 41.

The square root of 145509449 is about 12062.7297491074. The cubic root of 145509449 is about 525.9733405120.

The spelling of 145509449 in words is "one hundred forty-five million, five hundred nine thousand, four hundred forty-nine".