645106213 has 8 divisors (see below), whose sum is σ = 655153920. Its totient is φ = 635085360.

The previous prime is 645106207. The next prime is 645106243. The reversal of 645106213 is 312601546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 645106213 - 2⁵ = 645106181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645106243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44731 + ... + 57367.

It is an arithmetic number, because the mean of its divisors is an integer number (81894240).

Almost surely, 2^645106213 is an apocalyptic number.

It is an amenable number.

645106213 is a deficient number, since it is larger than the sum of its proper divisors (10047707).

645106213 is a wasteful number, since it uses less digits than its factorization.

645106213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13427.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 645106213 is about 25398.9411787185. The cubic root of 645106213 is about 864.0596831807.

Adding to 645106213 its reverse (312601546), we get a palindrome (957707759).

The spelling of 645106213 in words is "six hundred forty-five million, one hundred six thousand, two hundred thirteen".