145220617 has 2 divisors, whose sum is σ = 145220618. Its totient is φ = 145220616.

The previous prime is 145220587. The next prime is 145220633. The reversal of 145220617 is 716022541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123121216 + 22099401 = 11096^2 + 4701^2 .

It is a cyclic number.

It is not a de Polignac number, because 145220617 - 2¹⁹ = 144696329 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (145220657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72610308 + 72610309.

It is an arithmetic number, because the mean of its divisors is an integer number (72610309).

Almost surely, 2^145220617 is an apocalyptic number.

It is an amenable number.

145220617 is a deficient number, since it is larger than the sum of its proper divisors (1).

145220617 is an equidigital number, since it uses as much as digits as its factorization.

145220617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 145220617 is about 12050.7517192912. The cubic root of 145220617 is about 525.6250960933.

The spelling of 145220617 in words is "one hundred forty-five million, two hundred twenty thousand, six hundred seventeen".