145645213 has 4 divisors (see below), whose sum is σ = 166451680. Its totient is φ = 124838748.

The previous prime is 145645189. The next prime is 145645237. The reversal of 145645213 is 312546541.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (145645189) and next prime (145645237).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145645213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145643213) 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, 10403223 + ... + 10403236.

It is an arithmetic number, because the mean of its divisors is an integer number (41612920).

Almost surely, 2^145645213 is an apocalyptic number.

It is an amenable number.

145645213 is a deficient number, since it is larger than the sum of its proper divisors (20806467).

145645213 is an equidigital number, since it uses as much as digits as its factorization.

145645213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20806466.

The product of its digits is 14400, while the sum is 31.

The square root of 145645213 is about 12068.3558532221. The cubic root of 145645213 is about 526.1368718108.

The spelling of 145645213 in words is "one hundred forty-five million, six hundred forty-five thousand, two hundred thirteen".