145511309 has 2 divisors, whose sum is σ = 145511310. Its totient is φ = 145511308.

The previous prime is 145511281. The next prime is 145511321. The reversal of 145511309 is 903115541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87796900 + 57714409 = 9370^2 + 7597^2 .

It is a cyclic number.

It is not a de Polignac number, because 145511309 - 2⁸ = 145511053 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145511339) 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, 72755654 + 72755655.

It is an arithmetic number, because the mean of its divisors is an integer number (72755655).

Almost surely, 2^145511309 is an apocalyptic number.

It is an amenable number.

145511309 is a deficient number, since it is larger than the sum of its proper divisors (1).

145511309 is an equidigital number, since it uses as much as digits as its factorization.

145511309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2700, while the sum is 29.

The square root of 145511309 is about 12062.8068458382. The cubic root of 145511309 is about 525.9755816179.

The spelling of 145511309 in words is "one hundred forty-five million, five hundred eleven thousand, three hundred nine".