145212565 has 4 divisors (see below), whose sum is σ = 174255084. Its totient is φ = 116170048.

The previous prime is 145212559. The next prime is 145212607. The reversal of 145212565 is 565212541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 565212541 = 1721 ⋅328421.

It can be written as a sum of positive squares in 2 ways, for example, as 20711601 + 124500964 = 4551^2 + 11158^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145212565 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 an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14521252 + ... + 14521261.

It is an arithmetic number, because the mean of its divisors is an integer number (43563771).

Almost surely, 2^145212565 is an apocalyptic number.

It is an amenable number.

145212565 is a deficient number, since it is larger than the sum of its proper divisors (29042519).

145212565 is an equidigital number, since it uses as much as digits as its factorization.

145212565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29042518.

The product of its digits is 12000, while the sum is 31.

The square root of 145212565 is about 12050.4176276177. The cubic root of 145212565 is about 525.6153811929.

The spelling of 145212565 in words is "one hundred forty-five million, two hundred twelve thousand, five hundred sixty-five".