145868213 has 4 divisors (see below), whose sum is σ = 148971840. Its totient is φ = 142764588.

The previous prime is 145868183. The next prime is 145868221. The reversal of 145868213 is 312868541.

145868213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 312868541 = 8231 ⋅38011.

It is a cyclic number.

It is not a de Polignac number, because 145868213 - 2²⁰ = 144819637 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 (145868273) 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, 1551743 + ... + 1551836.

It is an arithmetic number, because the mean of its divisors is an integer number (37242960).

Almost surely, 2^145868213 is an apocalyptic number.

It is an amenable number.

145868213 is a deficient number, since it is larger than the sum of its proper divisors (3103627).

145868213 is an equidigital number, since it uses as much as digits as its factorization.

145868213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3103626.

The product of its digits is 46080, while the sum is 38.

The square root of 145868213 is about 12077.5913575514. The cubic root of 145868213 is about 526.4052607486.

The spelling of 145868213 in words is "one hundred forty-five million, eight hundred sixty-eight thousand, two hundred thirteen".