640524211 has 2 divisors, whose sum is σ = 640524212. Its totient is φ = 640524210.

The previous prime is 640524169. The next prime is 640524251. The reversal of 640524211 is 112425046.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 640524211 - 2⁷ = 640524083 is a prime.

It is not a weakly prime, because it can be changed into another prime (640524251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320262105 + 320262106.

It is an arithmetic number, because the mean of its divisors is an integer number (320262106).

Almost surely, 2^640524211 is an apocalyptic number.

640524211 is a deficient number, since it is larger than the sum of its proper divisors (1).

640524211 is an equidigital number, since it uses as much as digits as its factorization.

640524211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 640524211 is about 25308.5797902609. The cubic root of 640524211 is about 862.0090989613.

Adding to 640524211 its reverse (112425046), we get a palindrome (752949257).

The spelling of 640524211 in words is "six hundred forty million, five hundred twenty-four thousand, two hundred eleven".