145412213 has 4 divisors (see below), whose sum is σ = 146746380. Its totient is φ = 144078048.

The previous prime is 145412191. The next prime is 145412221. The reversal of 145412213 is 312214541.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 69338929 + 76073284 = 8327^2 + 8722^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145412213 is a prime.

It is a super-2 number, since 2×145412213² = 42289423379114738, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145412273) by changing a digit.

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, 666920 + ... + 667137.

It is an arithmetic number, because the mean of its divisors is an integer number (36686595).

Almost surely, 2^145412213 is an apocalyptic number.

It is an amenable number.

145412213 is a deficient number, since it is larger than the sum of its proper divisors (1334167).

145412213 is a wasteful number, since it uses less digits than its factorization.

145412213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1334166.

The product of its digits is 960, while the sum is 23.

The square root of 145412213 is about 12058.6986445470. The cubic root of 145412213 is about 525.8561546741.

Adding to 145412213 its reverse (312214541), we get a palindrome (457626754).

The spelling of 145412213 in words is "one hundred forty-five million, four hundred twelve thousand, two hundred thirteen".