646245227 has 2 divisors, whose sum is σ = 646245228. Its totient is φ = 646245226.

The previous prime is 646245199. The next prime is 646245269. The reversal of 646245227 is 722542646.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 646245227 - 2¹² = 646241131 is a prime.

It is not a weakly prime, because it can be changed into another prime (646245527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323122613 + 323122614.

It is an arithmetic number, because the mean of its divisors is an integer number (323122614).

Almost surely, 2^646245227 is an apocalyptic number.

646245227 is a deficient number, since it is larger than the sum of its proper divisors (1).

646245227 is an equidigital number, since it uses as much as digits as its factorization.

646245227 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 38.

The square root of 646245227 is about 25421.3537601757. The cubic root of 646245227 is about 864.5679185667.

The spelling of 646245227 in words is "six hundred forty-six million, two hundred forty-five thousand, two hundred twenty-seven".