145730317 has 4 divisors (see below), whose sum is σ = 145778940. Its totient is φ = 145681696.

The previous prime is 145730303. The next prime is 145730357. The reversal of 145730317 is 713037541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 713037541 = 31 ⋅23001211.

It can be written as a sum of positive squares in 2 ways, for example, as 30404196 + 115326121 = 5514^2 + 10739^2 .

It is a cyclic number.

It is not a de Polignac number, because 145730317 - 2¹¹ = 145728269 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145730357) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19498 + ... + 25915.

It is an arithmetic number, because the mean of its divisors is an integer number (36444735).

Almost surely, 2^145730317 is an apocalyptic number.

It is an amenable number.

145730317 is a deficient number, since it is larger than the sum of its proper divisors (48623).

145730317 is an equidigital number, since it uses as much as digits as its factorization.

145730317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48622.

The product of its (nonzero) digits is 8820, while the sum is 31.

The square root of 145730317 is about 12071.8812535578. The cubic root of 145730317 is about 526.2393299988.

Adding to 145730317 its reverse (713037541), we get a palindrome (858767858).

The spelling of 145730317 in words is "one hundred forty-five million, seven hundred thirty thousand, three hundred seventeen".