145776509 has 2 divisors, whose sum is σ = 145776510. Its totient is φ = 145776508.

The previous prime is 145776503. The next prime is 145776517. The reversal of 145776509 is 905677541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125328025 + 20448484 = 11195^2 + 4522^2 .

It is a cyclic number.

It is not a de Polignac number, because 145776509 - 2²⁴ = 128999293 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 145776509.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145776503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72888254 + 72888255.

It is an arithmetic number, because the mean of its divisors is an integer number (72888255).

Almost surely, 2^145776509 is an apocalyptic number.

It is an amenable number.

145776509 is a deficient number, since it is larger than the sum of its proper divisors (1).

145776509 is an equidigital number, since it uses as much as digits as its factorization.

145776509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 264600, while the sum is 44.

The square root of 145776509 is about 12073.7943083357. The cubic root of 145776509 is about 526.2949246520.

The spelling of 145776509 in words is "one hundred forty-five million, seven hundred seventy-six thousand, five hundred nine".