145285717 has 4 divisors (see below), whose sum is σ = 149212396. Its totient is φ = 141359040.

The previous prime is 145285703. The next prime is 145285729. The reversal of 145285717 is 717582541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 717582541 = 13 ⋅55198657.

It can be written as a sum of positive squares in 2 ways, for example, as 139263601 + 6022116 = 11801^2 + 2454^2 .

It is a cyclic number.

It is not a de Polignac number, because 145285717 - 2⁷ = 145285589 is a prime.

It is a super-2 number, since 2×145285717² = 42215879128408178, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 145285717.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145205717) 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, 1963284 + ... + 1963357.

It is an arithmetic number, because the mean of its divisors is an integer number (37303099).

Almost surely, 2^145285717 is an apocalyptic number.

It is an amenable number.

145285717 is a deficient number, since it is larger than the sum of its proper divisors (3926679).

145285717 is an equidigital number, since it uses as much as digits as its factorization.

145285717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3926678.

The product of its digits is 78400, while the sum is 40.

The square root of 145285717 is about 12053.4524929582. The cubic root of 145285717 is about 525.7036273712.

The spelling of 145285717 in words is "one hundred forty-five million, two hundred eighty-five thousand, seven hundred seventeen".