145220317 has 16 divisors (see below), whose sum is σ = 160574400. Its totient is φ = 130240000.

The previous prime is 145220269. The next prime is 145220329. The reversal of 145220317 is 713022541.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-145220317 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 145220291 and 145220300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145220357) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 411213 + ... + 411565.

It is an arithmetic number, because the mean of its divisors is an integer number (10035900).

Almost surely, 2^145220317 is an apocalyptic number.

It is an amenable number.

145220317 is a deficient number, since it is larger than the sum of its proper divisors (15354083).

145220317 is a wasteful number, since it uses less digits than its factorization.

145220317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 145220317 is about 12050.7392719285. The cubic root of 145220317 is about 525.6247341437.

Adding to 145220317 its reverse (713022541), we get a palindrome (858242858).

The spelling of 145220317 in words is "one hundred forty-five million, two hundred twenty thousand, three hundred seventeen".