145205717 has 2 divisors, whose sum is σ = 145205718. Its totient is φ = 145205716.

The previous prime is 145205663. The next prime is 145205747. The reversal of 145205717 is 717502541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133310116 + 11895601 = 11546^2 + 3449^2 .

It is a cyclic number.

It is not a de Polignac number, because 145205717 - 2⁸ = 145205461 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145205747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72602858 + 72602859.

It is an arithmetic number, because the mean of its divisors is an integer number (72602859).

Almost surely, 2^145205717 is an apocalyptic number.

It is an amenable number.

145205717 is a deficient number, since it is larger than the sum of its proper divisors (1).

145205717 is an equidigital number, since it uses as much as digits as its factorization.

145205717 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9800, while the sum is 32.

The square root of 145205717 is about 12050.1334847378. The cubic root of 145205717 is about 525.6071186602.

The spelling of 145205717 in words is "one hundred forty-five million, two hundred five thousand, seven hundred seventeen".